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Balance Sheets - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Current assets:    
Cash and cash equivalents $ 14,303 $ 24,023
Marketable securities 39,947 39,934
Prepaid expenses and other current assets 2,737 3,213
Total current assets 56,987 67,170
Property and equipment, net 453 489
Restricted cash 270 270
Other assets   45
Total assets 57,710 67,974
Current liabilities:    
Accounts payable 1,886 1,208
Accrued expenses 4,291 4,954
Total current liabilities 6,177 6,162
Other long-term liabilities 126 88
Total liabilities $ 6,303 $ 6,250
Commitments and contingencies (Note 6)
Stockholders' equity:    
Preferred stock, $0.001 par value; 5,000,000 shares authorized; no shares issued or outstanding
Common stock, $0.001 par value; 200,000,000 shares authorized; 22,634,825 and 22,597,144 shares issued and outstanding at March 31, 2016 and December 31, 2015, respectively $ 23 $ 23
Additional paid-in capital 194,253 193,194
Accumulated other comprehensive loss (5) (55)
Accumulated deficit (142,864) (131,438)
Total stockholders' equity 51,407 61,724
Total liabilities and stockholders' equity $ 57,710 $ 67,974