Quarterly report pursuant to Section 13 or 15(d)

Capital Stock Transactions - Narrative (Details)

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Capital Stock Transactions - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended
Jul. 31, 2019
May 31, 2019
Jun. 30, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Mar. 31, 2019
Class Of Stock [Line Items]                
Series A convertible preferred stock authorized (in shares)       2,000,000   2,000,000   2,000,000
Series A convertible preferred stock, par value (in dollars per share)       $ 0.0001   $ 0.0001   $ 0.0001
Series A convertible preferred stock issued (in shares)       100,000   100,000   100,000
Total unrecognized stock base compensation expense       $ 3,547 $ 2,194 $ 3,547 $ 2,194  
Unvested stock options, weighted average period           2 years 1 month 28 days 2 years 5 days  
Equity Option                
Class Of Stock [Line Items]                
Options exercised (in shares)           2,169,876    
Restricted Stock                
Class Of Stock [Line Items]                
Vesting period 1 year 3 years 3 years          
Awarded (in shares) 75,494 109,416 232,558     184,910    
Fair value of shares issued $ 421              
Restricted Stock | Minimum                
Class Of Stock [Line Items]                
Vesting period           3 months    
Restricted Stock | Maximum                
Class Of Stock [Line Items]                
Vesting period           2 years    
Time Condition RSAs                
Class Of Stock [Line Items]                
Compensation expense       105 $ 123 $ 318 $ 365  
Non Vested Restricted Stock                
Class Of Stock [Line Items]                
Awarded (in shares)           75,494    
Total unrecognized stock base compensation expense       $ 246   $ 246    
Unvested stock options, weighted average period           7 months    
Convertible Preferred Stock                
Class Of Stock [Line Items]                
Series A convertible preferred stock authorized (in shares)       2,000,000   2,000,000    
Series A convertible preferred stock, par value (in dollars per share)       $ 0.0001   $ 0.0001    
Series A convertible preferred stock issued (in shares)       100,000   100,000    
Aggregate shares upon conversion (in shares)           20,000    
Liquidation preference (in dollars per share)       $ 10   $ 10