CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Cash flows from operating activities:
Net loss	$ (45,394)	$ (56,793)
Adjustments to reconcile net loss to cash flows used in operating activities:
Amortization of intangible assets	2,460	2,460
Depreciation of property and equipment	189	144
Amortization of debt discount	745	596
Non-cash interest expense	977	1,052
Loss on extinguishment of debt	905	3,810
Stock-based compensation	5,547	4,568
Changes in operating assets and liabilities:
Accounts receivable and other current assets	4,846	(15,304)
Inventory	(3,200)	(1,859)
Accounts payable and accrued expenses	1,872	4,596
Right-of-use assets and operating lease liabilities	72	46
Deferred revenue	16,546	(15)
Net cash used in operating activities	(14,435)	(56,699)
Cash flows from investing activities:
Purchases of property and equipment	(362)	(213)
Net cash used in investing activities	(362)	(213)
Cash flows from financing activities:
Proceeds from issuance of stock, net of issuance costs	49,918	22,627
Proceeds under paycheck protection program loan	2,041
Proceeds from issuance of long-term debt		50,000
Payment of debt issue costs		(1,341)
Payment of long-term debt principal	(13,794)	(20,000)
Payment of extinguishment of debt costs	(828)	(2,716)
Net settlement of stock units to satisfy statutory tax withholding	(90)	(120)
Proceeds from exercise of stock options	294	414
Payment of contingent development milestone		(15,000)
Principal payments on finance lease obligations	(49)
Net cash provided by financing activities	37,492	33,864
Effect of foreign exchange rate changes on cash and cash equivalents		1
Net increase (decrease) in cash, cash equivalents and restricted cash	22,695	(23,047)
Cash, cash equivalents and restricted cash at beginning of year	22,364	45,411
Cash, cash equivalents and restricted cash at end of year	45,059	22,364
Supplemental cash flow information:
Cash interest paid	5,510	4,870
Supplemental disclosure of non-cash investing and financing activities:
Accrued term loan exit fee	$ 122	$ 3,000