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Income (Loss) per Share
 6 Months Ended
Jun. 30, 2021
Earnings Per Share [Abstract]  
Income (Loss) per Share Income (Loss) per Share     Basic income (loss) per share is computed by dividing net income (loss) attributable to common stockholders by the sum of the weighted-average number of common shares outstanding and the weighted-average number of shares issuable under the common stock warrants, representing 161 thousand shares during the six months ended June 30, 2020. The common stock warrants are included in the calculation of basic income (loss) per share for the six months ended June 30, 2020 because they were issuable for minimal consideration. As of March 31, 2020, the previously outstanding common stock warrants had been exercised for common stock and no warrants were outstanding.
The following table sets forth the computation of basic and diluted income (loss) per share (in thousands, except per share amounts):
Three Months Ended June 30,Six Months Ended June 30,
2021202020212020
Net Loss$(108,958)$(40,560)$(171,185)$(262,897)
Less: Undistributed income allocated to participating securities— — — — 
Net loss attributable to common stockholders(108,958)(40,560)(171,185)(262,897)
Plus: Net income effect of convertible securities— — — — 
Numerator for diluted loss per common share$(108,958)$(40,560)$(171,185)$(262,897)
Basic weighted-average common stock shares outstanding59,367 53,265 56,837 53,246 
Plus: dilutive effects of common stock equivalents— — — — 
Diluted weighted-average common stock shares outstanding59,367 53,265 56,837 53,246 
Basic loss per common share$(1.84)$(0.76)$(3.01)$(4.94)
Diluted loss per common share$(1.84)$(0.76)$(3.01)$(4.94)
Diluted income (loss) per common share excludes the following equity instruments because their effect would be anti-dilutive:
Shares of unvested restricted stock830 581 828 555 
Shares of stock options2,288 2,309 2,188 2,231 
Common stock equivalents using the if-converted method of settling the 5.00% Convertible Senior Notes
2,258 2,704 2,480 2,704