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Condensed Consolidated Balance Sheets - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Current assets:    
Cash and cash equivalents $ 32,204 $ 35,168
Restricted cash 101 106
Short-term investments 66,181 94,806
Prepaid expenses and other current assets 6,210 3,362
Total current assets 104,696 133,442
Long-term investments   3,246
Property and equipment, net 415 267
Other assets 259 231
Total assets 105,370 137,186
Current liabilities:    
Accounts payable 5,297 2,232
Accrued expenses and other current liabilities 12,484 11,993
Current portion of deferred revenue 1,517 1,573
Total current liabilities 19,298 15,798
Long-term liabilities:    
Deferred revenue, less current portion 15,409 16,759
Other long-term liabilities 311 310
Total long-term liabilities 15,720 17,069
Total liabilities 35,018 32,867
Commitments
Stockholders’ equity:    
Preferred stock, $0.001 par value, 10,000,000 shares authorized; 0 shares outstanding at June 30, 2018 and December 31, 2017
Common stock, $0.0001 par value, 100,000,000 shares authorized; 22,705,794 and 24,390,033 shares issued and outstanding at June 30, 2018 and December 31, 2017, respectively 2 2
Additional paid-in capital 473,686 470,571
Accumulated other comprehensive loss (89) (143)
Accumulated deficit (403,247) (366,111)
Total stockholders’ equity 70,352 104,319
Total liabilities and stockholders’ equity $ 105,370 $ 137,186