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Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)
$ in Thousands
Total
Common Stock $0.001 Par
Additional Paid-in Capital
Other Accumulated Comprehensive Income
Accumulated Deficit
Balance at Dec. 31, 2017 $ 85,038 $ 16 $ 156,685 $ (9) $ (71,654)
Balance (in Shares) at Dec. 31, 2017   16,272,617      
Effect of adoption of ASU | ASU 2014-09 (ASC 606) 324       324
Sale of common stock 53,753 $ 6 53,747    
Sale of common stock, shares   5,899,500      
Equity-based compensation expense 919   919    
Unrealized gain (loss) on securities (102)     (102)  
Net loss (11,165)       (11,165)
Balance at Mar. 31, 2018 128,767 $ 22 211,351 (111) (82,495)
Balance (in Shares) at Mar. 31, 2018   22,172,117      
Balance at Dec. 31, 2018 124,098 $ 25 243,903 (65) (119,765)
Balance (in Shares) at Dec. 31, 2018   25,401,479      
Cancellation of restricted stock   (12,836)      
Equity-based compensation expense 954   954    
Unrealized gain (loss) on securities 104     104  
Net loss (12,946)       (12,946)
Balance at Mar. 31, 2019 $ 112,210 $ 25 $ 244,857 $ 39 $ (132,711)
Balance (in Shares) at Mar. 31, 2019   25,388,643