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Net Loss Per Share (Tables)
 12 Months Ended
Dec. 31, 2020
Earnings Per Share [Abstract]  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share
The following table sets forth the potential weighted common shares outstanding that were excluded from the diluted net loss per share computations:
December 31,
(in thousands)202020192018
2020 Notes312 1,322 — 
2022 Notes192 n/an/a
Stock options1,603 2,568 3,327 
Restricted stock units3,041 2,955 2,997 
Stock purchase rights under the ESPP531 478 609 
Warrants (1)
— 4,321 1,268 
  Total 5,679 11,644 8,201