Quarterly report pursuant to Section 13 or 15(d)

Capital Stock Transactions - Additional Information (Details)

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Capital Stock Transactions - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended
Jun. 30, 2018
Jun. 30, 2018
Jun. 30, 2017
Mar. 31, 2018
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 $ 2,747 $ 2,747 $ 3,491  
Unvested stock options, weighted average period   2 years 3 months 21 days 2 years 24 days  
Equity Option        
Class Of Stock [Line Items]        
Options exercised (in shares)   150,001    
Restricted Stock        
Class Of Stock [Line Items]        
Granted (shares)   232,558    
Restricted Stock | Minimum        
Class Of Stock [Line Items]        
Vesting period   3 months    
Restricted Stock | Maximum        
Class Of Stock [Line Items]        
Vesting period   2 years    
Non Vested Restricted Stock        
Class Of Stock [Line Items]        
Vesting period 3 years      
Granted (shares) 232,558 232,558    
Fair value of shares on date of issuance $ 400 $ 400    
Total unrecognized stock base compensation expense $ 413 $ 413    
Unvested stock options, weighted average period   3 years    
Time Condition RSAs        
Class Of Stock [Line Items]        
Compensation expense   $ 85 $ 76  
Convertible Preferred Stock        
Class Of Stock [Line Items]        
Series A convertible preferred stock authorized (in shares)       2,000,000
Series A convertible preferred stock, par value (in dollars per share)       $ 0.0001
Series A convertible preferred stock issued (in shares)       100,000
Aggregate shares upon conversion (shares)   20,000    
Liquidation preference (in dollars per share)       $ 10