CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Statement of Comprehensive Income [Abstract]
Product revenue, net	$ 103,386	$ 91,588	$ 197,074	$ 171,025
Operating expenses:
Cost of sales	1,316	1,384	2,566	2,652
Research and development	32,825	28,232	60,945	57,254
Selling, general and administrative	37,813	30,029	75,362	59,538
Total operating expenses	71,954	59,645	138,873	119,444
Income from operations	31,432	31,943	58,201	51,581
Interest and other income	630	110	710	385
Income before income taxes	32,062	32,053	58,911	51,966
Income tax expense	(4,650)	(5,530)	(8,702)	(1,978)
Net income	27,412	26,523	50,209	49,988
Net income attributable to common stockholders basic	27,398	26,523	50,196	49,988
Net income attributable to common stockholders diluted	$ 27,398	$ 26,523	$ 50,196	$ 49,988
Basic net income per share (in dollars per share)	$ 0.26	$ 0.23	$ 0.47	$ 0.43
Diluted net income per share (in dollars per share)	$ 0.24	$ 0.21	$ 0.44	$ 0.39
Weighted-average shares outstanding used in computing net income per common share
Basic (in shares)	106,289	116,294	106,151	116,555
Diluted (in shares)	115,399	126,680	115,222	128,204