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CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($)
$ in Thousands
Common Stock [Member]
Accumulated Deficit [Member]
Accumulated Other Comprehensive Income/(Loss) [Member]
Total
Balances, beginning of period at Dec. 31, 2016 $ 455,443 $ (414,933) $ 15 $ 40,525
Balances, beginning of period (in shares) at Dec. 31, 2016 97,786,608      
Shares issued (RSUs vested, net of shares withheld) $ (264)     (264)
Shares issued (RSUs vested, net of shares withheld) (in shares) 1,625,399      
Stock-based compensation $ 874     874
Other comprehensive loss     (17) (17)
Net loss   (12,035)   (12,035)
Balances, end of period (Scenario, Previously Reported [Member]) at Dec. 31, 2017 456,053 (426,968) (2) 29,083
Balances, end of period at Dec. 31, 2017 $ 456,053 (426,970)   29,083
Balances, end of period (in shares) (Scenario, Previously Reported [Member]) at Dec. 31, 2017 99,412,007      
Balances, end of period (in shares) at Dec. 31, 2017 99,412,007      
Cumulative adjustment related to Accounting Standard Update 2016-01 | Accounting Standards Update 2016-01 [Member]   (2) $ 2  
Shares issued (RSUs vested, net of shares withheld) $ (39)     (39)
Shares issued (RSUs vested, net of shares withheld) (in shares) 127,942      
Stock-based compensation $ 338     338
Net loss   (948)   (948)
Balances, end of period at Mar. 31, 2018 $ 456,352 $ (427,918)   $ 28,434
Balances, end of period (in shares) at Mar. 31, 2018 99,539,949