CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 138,579	$ 44,909
Accounts and other receivables, net	12,332	9,453
Prepaid expenses and other current assets	2,856	3,419
Inventory	5,586	5,337
Total current assets	159,353	63,118
Property and equipment, net	559	630
Operating lease right-of-use assets	2,484	2,610
Intangible assets, net	24,594	25,209
Restricted cash	150	150
Total assets	187,140	91,717
Current liabilities:
Accounts payable	5,855	4,811
Accrued expenses	5,915	8,445
Deferred revenue	973	945
Other current liabilities	698	687
Total current liabilities	13,441	14,888
Long-term debt	38,124	37,977
Deferred revenue - noncurrent	15,349	15,616
Operating lease liabilities - noncurrent	2,172	2,330
Other long-term liabilities	2,347	2,365
Total liabilities	71,433	73,176
Contingencies (Note 13)
Stockholders' equity:
Preferred stock, $.001 par value, 5,000,000 shares authorized, no shares issued and outstanding
Common stock, $.001 par value, 300,000,000 shares authorized at March 31, 2021 and December 31, 2020; 28,741,475 and 18,139,981 shares issued and outstanding at March 31, 2021 and December 31, 2020, respectively	29	18
Additional paid-in capital	637,797	528,362
Accumulated deficit	(522,960)	(510,680)
Accumulated other comprehensive income	841	841
Total stockholders' equity	115,707	18,541
Total liabilities and stockholders' equity	$ 187,140	$ 91,717