Stockholders' Equity - Summary of Common Stock Reserved for Future Issuance (Details) - shares shares in Thousands	Dec. 31, 2021	Dec. 31, 2020
Class of Stock [Line Items]
Common stock reserved for future issuance (shares)	27,017	21,943
Convertible senior notes
Class of Stock [Line Items]
Common stock reserved for future issuance (shares)	12,313	12,313
Warrants
Class of Stock [Line Items]
Common stock reserved for future issuance (shares)	0	28
Outstanding stock options and stock unit awards
Class of Stock [Line Items]
Common stock reserved for future issuance (shares)	7,790	5,703
Reserved for future grants under employee equity plans
Class of Stock [Line Items]
Common stock reserved for future issuance (shares)	6,914	3,899