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Condensed Consolidated Balance Sheets - USD ($)
Jun. 30, 2018
Dec. 31, 2017
Current assets:    
Cash and cash equivalents $ 46,533,000 $ 14,472,000
Short-term investments 89,613,000 17,971,000
Restricted cash 175,000 5,333,000
Prepaid and other current assets 2,656,000 1,333,000
Total current assets 138,977,000 39,109,000
Other assets, noncurrent 274,000 128,000
Property and equipment, net 291,000 276,000
Total assets 139,542,000 39,513,000
Current liabilities:    
Accounts payable 134,000 747,000
Accrued compensation 897,000 1,366,000
Other accrued liabilities 1,398,000 1,322,000
Deferred revenue   212,000
Deferred rent, current portion 10,000 7,000
Redeemable convertible notes 0 5,085,000
Total current liabilities 2,439,000 8,739,000
Deferred rent, noncurrent portion 140,000  
Total liabilities 2,579,000 8,739,000
Stockholders’ equity:    
Preferred stock, $0.001 par value, 5,000,000 shares authorized; 0 and 3,680 shares issued and outstanding at June 30, 2018 and December 31, 2017, respectively
Common stock, $0.001 par value, 100,000,000 shares authorized; 11,942,729 and 6,081,230 shares issued and outstanding at June 30, 2018 and December 31, 2017, respectively 12,000 6,000
Additional paid-in capital 321,758,000 204,262,000
Accumulated other comprehensive income 4,000  
Accumulated deficit (184,811,000) (173,494,000)
Total stockholders’ equity 136,963,000 30,774,000
Total liabilities and stockholders’ equity $ 139,542,000 $ 39,513,000