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Consolidated Balance Sheets - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Current assets:    
Cash and cash equivalents $ 31,213,000 $ 14,472,000
Short-term investments 88,914,000 17,971,000
Restricted cash 50,000 5,333,000
Prepaid and other current assets 3,814,000 1,333,000
Total current assets 123,991,000 39,109,000
Other assets, noncurrent 543,000 128,000
Property and equipment, net 386,000 276,000
Total assets 124,920,000 39,513,000
Current liabilities:    
Accounts payable 1,248,000 747,000
Accrued compensation 1,495,000 1,366,000
Other accrued liabilities 2,043,000 1,322,000
Deferred revenue, current portion   212,000
Deferred rent, current portion 15,000 7,000
Redeemable convertible notes 0 5,085,000
Total current liabilities 4,801,000 8,739,000
Deferred rent, noncurrent portion 174,000  
Total liabilities 4,975,000 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 December 31, 2018 and 2017, respectively
Common stock, $0.001 par value, 100,000,000 shares authorized; 11,954,528 and 6,081,230 shares issued and outstanding at December 31, 2018 and 2017, respectively 12,000 6,000
Additional paid-in capital 323,279,000 204,262,000
Accumulated other comprehensive loss (4,000)  
Accumulated deficit (203,342,000) (173,494,000)
Total stockholders’ equity 119,945,000 30,774,000
Total liabilities and stockholders’ equity $ 124,920,000 $ 39,513,000