Unaudited Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 98,281	$ 15,668
Short-term investments	10,958	39,983
Prepaid expenses and other current assets	1,663	1,692
Total current assets	110,902	57,343
Property and equipment, net	690	735
Operating lease right-of-use asset	1,740	2,203
Total assets	113,332	60,281
Current liabilities:
Accounts payable	655	239
Accrued liabilities	2,725	3,549
Current portion of operating lease liability	722	600
Total current liabilities	4,102	4,388
Unvested stock liability	34	109
Warrant liability		184
Operating lease liability, net of current portion	1,199	1,748
Long-term debt, net of debt discount	9,309	9,099
Other long-term liabilities	525	525
Commitments and contingencies (Note 3)
Convertible preferred stock, $0.0001 par value; authorized shares – 10,000,000 and 85,683,310 at September 30, 2020 and December 31, 2019, respectively; issued and outstanding shares – none and 85,093,688 at September 30, 2020 and December 31, 2019, respectively; Liquidation preference – none and $123,100 at September 30, 2020 and December 31, 2019, respectively.		122,465
Stockholders’ equity (deficit):
Common stock, $0.0001 par value; authorized shares – 200,000,000 and 111,098,749 at September 30, 2020 and December 31, 2019, respectively; issued shares – 25,957,408 and 2,682,397 at September 30, 2020 and December 31, 2019, respectively; outstanding shares – 25,909,488 and 2,484,848 at September 30, 2020 and December 31, 2019, respectively.	3
Additional paid-in-capital	208,076	5,164
Accumulated other comprehensive income	14	41
Accumulated deficit	(109,930)	(83,442)
Total stockholders’ equity (deficit)	98,163	(78,237)
Total liabilities, convertible preferred stock, and stockholders’ equity (deficit)	$ 113,332	$ 60,281