Condensed Consolidated Statements of Cash Flows (Unaudited)	3 Months Ended	6 Months Ended
	Jun. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)
Operating activities
Net income (loss)	$ 3,733,000	$ 18,151,000	$ (24,183,000)
Adjustments to reconcile net income (loss) to net cash provided by (used for) operating activities:
Share-based compensation expense		2,140,000	3,997,000
Depreciation expense		56,000	1,798,000
Non-cash interest expense		3,718,000	3,392,000
Inventory fair value step-up adjustment included in cost of product sales		850,000
Amortization of intangible assets	400,000	776,000	0
Loss on change in fair value of contingent value rights		370,000
Amortization of right-of-use lease assets		117,000	699,000
Loss on disposal of property and equipment			904,000
Unrealized gains on short-term investments			(63,000)
Changes in operating assets and liabilities:
Accounts receivable, net		(2,762,000)	1,117,000
Inventory, net		(318,000)	(909,000)
Prepaid expenses and other current assets		(1,813,000)	1,675,000
Accounts payable		(920,000)	(1,696,000)
Accrued expenses		5,032,000	(3,378,000)
Accrued payroll and related expenses		(966,000)	(2,591,000)
Lease liabilities		(117,000)	(1,357,000)
Net cash provided by (used for) operating activities		24,314,000	(20,595,000)
Investing activities
Proceeds from the sale of property and equipment			2,860,000
Purchases of short-term investments			(2,999,000)
Net cash used for investing activities			(139,000)
Financing activities
Net proceeds from issuance of common stock under 2013 Equity Plan		155,000	605,000
Net proceeds from issuance of common stock under ESPP		198,000	359,000
Net cash provided by financing activities		353,000	964,000
Net increase (decrease) in cash, cash equivalents and restricted cash		24,667,000	(19,770,000)
Cash, cash equivalents and restricted cash, beginning of period		21,261,000	88,729,000
Cash, cash equivalents and restricted cash, end of period	45,928,000	45,928,000	68,959,000
Reconciliation of cash, cash equivalents and restricted cash to the condensed consolidated balance sheets
Cash and cash equivalents	45,888,000	45,888,000	68,353,000
Restricted cash	40,000	40,000	606,000
Cash, cash equivalents and restricted cash, end of period	$ 45,928,000	$ 45,928,000	$ 68,959,000