Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 48,338	$ 46,668
Short-term investments	323
Accounts receivable, net	5,927	8,610
Inventory, net	8,299	6,281
Prepaid expenses and other current assets	3,474	5,756
Total current assets	66,361	67,315
Goodwill	20,123	20,123
Intangible assets, net	12,545	13,321
Right-of-use lease assets	232	318
Property and equipment, net	65	113
Restricted cash	40	40
Total assets	99,366	101,230
Current liabilities:
Accounts payable	2,125	2,278
Accrued expenses and other current liabilities	5,666	4,866
Accrued interest expense on deferred royalty obligation, current portion	5,696	5,163
Deferred revenue	2,849	2,849
Paycheck Protection Program loan		2,325
Lease liabilities, current portion	157	154
Total current liabilities	16,493	17,635
Deferred royalty obligation, net	124,536	124,503
Accrued interest expense on deferred royalty obligation, less current portion	26,794	24,590
Lease liabilities, less current portion	75	164
Fair value of contingent value rights	936	1,076
Total liabilities	168,834	167,968
Commitments and contingencies (Note 8)
Stockholders’ deficit:
Common Stock, $0.0001 par value; 100,000,000 shares authorized, 24,950,487 and 26,783,544 shares issued and outstanding at June 30, 2022 and December 31, 2021, respectively	3	3
Additional paid-in capital	981,254	986,444
Accumulated deficit	(1,054,632)	(1,057,092)
Total stockholders’ deficit	(69,468)	(66,738)
Total liabilities and stockholders’ deficit	99,366	101,230
Series C-1 Convertible Preferred Stock
Stockholders’ deficit:
Series C-12 Convertible Preferred Stock, $0.0001 par value; 11,000 shares authorized, 3,906.5192257295 shares issued and outstanding at June 30, 2022 and December 31, 2021; and liquidation preference of $3,907 at June 30, 2022 and December 31, 2021	$ 3,907	$ 3,907