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Consolidated Balance Sheets - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Current assets:    
Cash and cash equivalents $ 22,112 $ 18,548
Short-term investments, available-for-sale 138,335 132,972
Accounts receivable 426 1,682
Prepaid expenses and other current assets 3,051 3,331
Total current assets 163,924 156,533
Long-term investments 49,225 76,731
Property and equipment, net of accumulated depreciation 1,688 1,894
Other long-term assets 61 72
Total assets 214,898 235,230
Current liabilities:    
Accounts payable 1,892 3,812
Accrued liabilities 7,109 9,384
Total current liabilities 9,001 13,196
Lease-related obligations 206 224
Total liabilities 9,207 13,420
Stockholders’ equity:    
Preferred stock, $0.001 par value, 10,000,000 shares authorized at March 31, 2018 and December 31, 2017; no shares issued and outstanding as of March 31, 2018 and December 31, 2017 0 0
Common stock, $0.001 par value, 200,000,000 shares authorized at March 31, 2018 and December 31, 2017; 47,753,300 and 47,505,532 shares issued and outstanding as of March 31, 2018 and December 31, 2017, respectively 48 47
Additional paid-in capital 713,323 709,514
Accumulated other comprehensive loss, net (1,066) (963)
Accumulated deficit (506,614) (486,788)
Total stockholders’ equity 205,691 221,810
Total liabilities and stockholders’ equity $ 214,898 $ 235,230