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Consolidated Balance Sheets - USD ($)
shares in Thousands, $ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Assets, Current [Abstract]    
Cash and cash equivalents $ 46,345 $ 64,065
Short-term investments 92,012 22,678
Accounts receivable, net of allowances of $4 28 14
Prepaid expenses and other current assets 2,481 2,164
Total current assets 140,866 88,921
Property and equipment, net of accumulated depreciation and amortization of $61,741 and $60,006, respectively 2,071 1,176
Goodwill 44,543 44,543
Operating lease right-of-use-assets 6,819  
Total assets 194,299 136,909
Liabilities, Current [Abstract]    
Accounts payable 10,395 9,152
Accrued liabilities 12,777 12,972
Total current liabilities 23,172 22,124
Long-term debt, net of issuance costs   0
Long-term operating lease liabilities 5,424 1,190
Total liabilities 77,175 23,314
Commitments and contingencies
Stockholders' Equity:    
Preferred stock, $.01 par value; 5,000 shares authorized; no shares issued and outstanding 0 0
Common stock, $.001 par value; 225,000 shares authorized; 106,679 and 106,162 shares issued, respectively 189 150
Additional paid-in capital 1,709,144 1,608,749
Accumulated deficit (1,589,720) (1,487,776)
Accumulated other comprehensive loss (428) (10)
Treasury stock, at cost, 407 and 236 shares, respectively (2,061) (7,518)
Total stockholders' equity 117,124 113,595
Total liabilities and stockholders’ equity $ 194,299 $ 136,909
Preferred stock, par value per share (usd per share) $ 0.01 $ 0.01
Preferred stock, shares authorized 5,000 5,000
Preferred stock, shares issued 0 0
Preferred stock, shares outstanding 0 0
Common stock, par value per share (usd per share) $ 0.001 $ 0.001
Common stock, shares authorized 300,000 300,000