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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash flows from operating activities
Net income (loss)	$ 486	$ (612)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation of property and equipment	351	332
Stock-based compensation	3,944	3,282
Amortization of discounts and premiums on marketable securities	(287)	(906)
Intangible asset amortization	370	380
Deferred income taxes	879	0
Other non-cash adjustments, net	314	317
Changes in operating assets and liabilities:
Accounts receivable	(2,905)	2,434
Prepaid expenses and other assets	(3,524)	247
Inventory	76	(44)
Accounts payable and other liabilities	(1,795)	3,507
Product revenue allowances	1,184	706
Net cash provided by (used in) operating activities	(907)	9,643
Cash flows from investing activities
Purchases of property and equipment	(373)	(393)
Purchases of marketable securities	(41,400)	(100,803)
Maturities of marketable securities	62,073	64,745
Net cash provided by (used in) investing activities	20,300	(36,451)
Cash flows from financing activities
Proceeds from the exercise of stock options	479	179
Net cash provided by financing activities	479	179
Effect of exchange rate changes on cash, cash equivalents and restricted cash	5	2
Net change in cash, cash equivalents and restricted cash	19,877	(26,627)
Cash, cash equivalents and restricted cash
Beginning of period	45,650	61,749
End of period	$ 65,527	$ 35,122

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration