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Condensed Consolidated Statement of Stockholders' Equity (Unaudited) - 3 months ended Mar. 31, 2018 - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Income (Loss)
Accumulated Deficit
Beginning Balance at Dec. 31, 2017 $ 218,844 $ 8 $ 717,930 $ (381) $ (498,713)
Beginning Balance, Shares at Dec. 31, 2017 79,021,878 79,021,878      
Stock-based compensation expense $ 9,073 $ 0 9,073 0 0
Vesting of restricted stock units 0 $ 0 0 0 0
Vesting of restricted stock units, Shares   70,200      
Exercise of warrants 23 $ 0 23 0 0
Exercise of warrants, Shares   14,270      
Employee payroll taxes withheld related to vesting of restricted stock units (73) $ 0 (73) 0 0
Employee payroll taxes withheld related to vesting of restricted stock units, Shares   (18,148)      
Cumulative effect of the adoption of the new revenue standard 186 $ 0 0 0 186
Other comprehensive income, net (174) 0 0 (174) 0
Net loss (27,519) 0 0 0 (27,519)
Ending Balance at Mar. 31, 2018 $ 200,360 $ 8 $ 726,953 $ (555) $ (526,046)
Ending Balance, Shares at Mar. 31, 2018 79,088,200 79,088,200