Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 46,668	$ 21,221
Accounts receivable, net	8,610	5,834
Inventory, net	6,281	6,013
Prepaid expenses and other current assets	5,756	3,388
Total current assets	67,315	36,456
Goodwill	20,123	20,123
Intangible assets, net	13,321	14,873
Right-of-use lease assets	318	536
Property and equipment, net	113	215
Restricted cash	40	40
Total assets	101,230	72,243
Current liabilities:
Accounts payable	2,278	2,762
Accrued expenses	4,866	5,617
Accrued interest expense on deferred royalty obligation, current portion	5,163	3,567
Deferred revenue	2,849	188
Paycheck Protection Program loan, current portion	2,325
Lease liabilities, current portion	154	204
Total current liabilities	17,635	12,338
Deferred royalty obligation, net	124,503	124,437
Accrued interest expense on deferred royalty obligation, less current portion	24,590	19,111
Lease liabilities, less current portion	164	332
Other noncurrent liabilities	1,076	4,112
Total liabilities	167,968	160,330
Commitments and contingencies (Note 6)
Stockholders’ deficit:
Common Stock, $0.0001 par value; 100,000,000 shares authorized, 26,783,544 and 27,402,648 shares issued and outstanding at December 31, 2021 and December 31, 2020, respectively	3	3
Additional paid-in capital	986,445	984,756
Accumulated deficit	(1,057,092)	(1,076,752)
Total stockholders’ deficit	(66,738)	(88,087)
Total liabilities and stockholders’ deficit	101,230	72,243
Series C-1 Convertible Preferred Stock
Stockholders’ deficit:
Series C-12 Convertible Preferred Stock, $0.0001 par value; 11,000 shares authorized, 3,906 shares issued and outstanding at December 31, 2021 and December 31, 2020; and liquidation preference of $3,906 at December 31, 2021 and December 31, 2020	$ 3,906	$ 3,906