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Net Loss Per Share
 9 Months Ended
Sep. 30, 2021
Earnings Per Share [Abstract]  
Net Loss Per Share Net Loss Per Share
The table below provides a reconciliation of the numerators and denominators of basic and diluted net loss per share for the three and nine months ended September 30, 2021 and 2020 (in thousands, except per share amounts):
Three Months Ended
September 30,		Nine Months Ended
September 30,
2021202020212020
Numerators:
Net loss$(13,042)$(19,969)$(44,123)$(449,636)
Less: Income attributable to unvested restricted stock awards— — — — 
Numerator for basic net loss per share(13,042)(19,969)(44,123)(449,636)
Effect of dilutive securities:
Unvested restricted stock awards— — — — 
Numerator for diluted net loss per share$(13,042)$(19,969)$(44,123)$(449,636)
Denominators:
Weighted average number of common shares outstanding61,378 61,028 61,294 60,928 
Less: Weighted average number of unvested restricted stock awards outstanding(1,001)(1,157)(1,030)(1,140)
Denominator for basic and diluted net loss per share60,377 59,871 60,264 59,788 
Net loss per share:
Basic$(0.22)$(0.33)$(0.73)$(7.52)
Diluted(0.22)(0.33)(0.73)(7.52)
The calculation of diluted net loss per share for the three and nine months ended September 30, 2021 excluded 394 thousand shares and 444 thousand shares, respectively, issuable pursuant to outstanding stock options, due to their antidilutive effect. The calculation of diluted net loss per share for the three and nine months ended September 30, 2020 excluded 560 thousand shares and 595 thousand shares, respectively, issuable pursuant to outstanding stock options, due to their antidilutive effect. Additionally, shares issuable upon conversion of both the 2023 Notes and the 2026 Notes were excluded due to, among other factors, their antidilutive effect.