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Stockholders' Equity (Tables)
12 Months Ended
Dec. 31, 2021
Equity [Abstract]  
Summary of Common Stock Reserved for Future Issuance
The following table presents common stock reserved for future issuance for the following financial instruments:
 December 31,
(In thousands)20212020
Outstanding stock options and stock unit awards7,790 5,703 
Warrants to purchase common stock— 28 
Reserved for future grants under employee equity plans6,914 3,899 
Reserved for issuance upon conversion of convertible senior notes12,313 12,313 
Total27,017 21,943 
Schedule of Accumulated Other Comprehensive Income
A summary of changes in the balances of each component of accumulated other comprehensive loss, net of tax, follows:
(In thousands)
Net Unrealized Gains (Losses) on Marketable Securities
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income
Balance at December 31, 2018— 
Amounts arising during the period702 — 702 
Reclassification adjustments(326)— (326)
Balance at December 31, 2019379 — 379 
Amounts arising during the period(197)(260)(457)
Reclassification adjustments— 
Balance at December 31, 2020$189 $(260)$(71)
Amounts arising during the period(202)288 86 
Balance at December 31, 2021$(13)$28 $15