Consolidated Balance Sheets-Unaudited - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 59,520	$ 64,065
Short-term investments	26,982	22,678
Accounts receivable, net	37	14
Prepaid expenses and other current assets	1,892	2,164
Total current assets	88,431	88,921
Property and equipment, net of accumulated depreciation and amortization of $4,962 and $4,853, respectively	1,142	1,176
Goodwill	44,543	44,543
Other assets	2,062	2,269
Total assets	136,178	136,909
Current liabilities:
Accounts payable	9,321	9,152
Accrued liabilities	9,584	12,972
Total current liabilities	18,905	22,124
Other long-term liabilities	1,098	1,190
Total liabilities	43,480	23,314
Commitments and contingencies
Equity:
Preferred stock, $0.01 par value; 5,000 shares authorized; no shares issued and outstanding	0	0
Common stock, $0.001 par value; 225,000 shares authorized; 150,082 and 150,082 shares issued, respectively	150	150
Additional paid-in capital	1,605,898	1,608,749
Accumulated deficit	(1,511,252)	(1,487,776)
Accumulated other comprehensive loss	(37)	(10)
Treasury stock, at cost, 488 and 1,165 shares, respectively	(2,061)	(7,518)
Total stockholder's equity (deficit)	92,698	113,595
Total liabilities and equity	136,178	136,909
Long-term debt, net of deferred issuance costs	$ 23,477	$ 0