Quarterly report pursuant to Section 13 or 15(d)

Liquidity (Details)

v3.10.0.1
Liquidity (Details) - USD ($)
Sep. 28, 2016
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
May 23, 2017
Mar. 31, 2017
Debt Instrument [Line Items]            
Cash   $ 10,531,000 $ 13,051,000 $ 7,214,000   $ 6,480,000
Convertible notes            
Debt Instrument [Line Items]            
Debt face amount $ 16,000,000 $ 4,700,000        
Interest rate 8.75%          
Proceeds from debt $ 14,316,000          
Credit Agreement | Western Alliance Bank            
Debt Instrument [Line Items]            
Credit agreement, total facility amount         $ 5,000,000