Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Operating activities
Net income (loss)	$ 14,418	$ (8,591)
Adjustments to reconcile net income (loss) to net cash provided by (used for) operating activities:
Share-based compensation expense	1,116	2,407
Depreciation expense	29	1,060
Non-cash interest expense	1,736	1,682
Inventory fair value step-up adjustment included in cost of product sales	850
Amortization of intangible assets	388	0
Loss on change in fair value of contingent value rights	450
Amortization of right-of-use lease assets	46	345
Loss on disposal of property and equipment		148
Changes in operating assets and liabilities:
Accounts receivable, net	1,681	(592)
Inventory, net	(211)	251
Prepaid expenses and other current assets	(2,716)	1,084
Accounts payable	(1,664)	(2,282)
Accrued expenses	2,286	(2,404)
Accrued payroll and related expenses	(1,185)	(4,683)
Lease liabilities	(46)	(674)
Net cash provided by (used for) operating activities	17,178	(12,249)
Investing activities
Proceeds from the sale of property and equipment		1,143
Net cash provided by investing activities		1,143
Financing activities
Net proceeds from issuance of common stock under 2013 Equity Plan	154	305
Net proceeds from issuance of common stock under ESPP	81	200
Net cash provided by financing activities	235	505
Net increase (decrease) in cash, cash equivalents and restricted cash	17,413	(10,601)
Cash, cash equivalents and restricted cash, beginning of period	21,261	88,729
Cash, cash equivalents and restricted cash, end of period	38,674	78,128
Reconciliation of cash, cash equivalents and restricted cash to the condensed consolidated balance sheets
Cash and cash equivalents	38,634	77,219
Restricted cash	40	909
Cash, cash equivalents and restricted cash, end of period	$ 38,674	$ 78,128