3. Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2021

Accounting Policies [Abstract]

Schedule of Fair Value Hierarchy Assets and Liabilities

		Fair Value Measurements
		as of June 30, 2021
		(Level 1)		(Level 2)		(Level 3)		Total
Assets:
Cash	$	87,200	$	-	$	-	$	87,200
Liabilities:
Warrant liabilities, at fair value	$	-	$	-	$	733	$	733

		Fair Value Measurements
		as of December 31, 2020
		(Level 1)		(Level 2)		(Level 3)		Total
Assets:
Cash	$	15,662	$	-	$	-	$	15,662
Liabilities:
Warrant liabilities, at fair value	$	-	$	-	$	1,062	$	1,062

Summary of Fair Value Measurements Valuation Assumptions

The following assumptions were used in determining the fair value of the warrant liabilities valued using the Black-Scholes option pricing model as of June 30, 2021:

		Six Months Ended
		June 30, 2021
Risk-free interest rate		0.37%
Volatility		119.55%
Dividend yield		-%
Expected term (in years)		2.57
Weighted-average fair value	$	2.43

Schedule of Fair Value Level 3 Reconciliation

The following table is a reconciliation for the common stock warrant liabilities measured at fair value using Level 3 unobservable inputs (in thousands):

		Warrant liabilities
Balance as of December 31, 2020	$	1,062
Warrant liability reclassified to stockholders' equity		(1,155)
Change in fair value measurement of warrant liability		826
Balance as of June 30, 2021	$	733

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share

The following potentially dilutive securities outstanding for the three and six months ended June 30, 2021 and 2020 have been excluded from the computation of diluted weighted average shares outstanding, as they would be anti-dilutive (in thousands):

	Three and Six Months
	Ended June 30,
	2021	2020
Outstanding stock options	7,199	4,925
Restricted stock units	2,400	67
Outstanding warrants	2,635	3,584
Convertible debt	17	-
	12,251	8,576