Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 24,393	$ 15,668
Short-term investments	71,783	39,983
Prepaid expenses and other current assets	5,847	1,692
Total current assets	102,023	57,343
Property and equipment, net	634	735
Operating lease right-of-use asset	1,579	2,203
Total assets	104,236	60,281
Current liabilities:
Accounts payable	334	239
Accrued liabilities	2,951	3,549
Current portion of operating lease liability	741	600
Total current liabilities	4,026	4,388
Unvested stock liability	27	109
Warrant liability		184
Operating lease liability, net of current portion	1,007	1,748
Long-term debt, net of debt discount	9,372	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 December 31, 2020 and 2019, respectively; issued and outstanding shares – none and 85,093,688 at December 31, 2020 and 2019, respectively; Liquidation preference – none and $123,100 at December 31, 2020 and 2019, respectively.		122,465
Stockholders’ equity (deficit):
Common stock, $0.0001 par value; authorized shares – 200,000,000 and 111,098,749 at December 31, 2020 and 2019, respectively; issued shares – 26,005,934 and 2,682,397 at December 31, 2020 and 2019, respectively; outstanding shares – 25,969,442 and 2,484,848 at December 31, 2020 and 2019, respectively.	3
Additional paid-in-capital	210,021	5,164
Accumulated other comprehensive income	1	41
Accumulated deficit	(120,746)	(83,442)
Total stockholders’ equity (deficit)	89,279	(78,237)
Total liabilities, convertible preferred stock, and stockholders’ equity (deficit)	$ 104,236	$ 60,281