Debts (Tables)

12 Months Ended

Dec. 31, 2020

Debt Disclosure [Abstract]

Schedule of promissory note obligation

The Company’s promissory note obligation at December 31, 2020 and 2019 consists of the following (in thousands):

			Stated Value at December 31,
	Interest Rate	Due Date	2020		2019
Yaskawa Note	1.00%	September 2022	$	15,486	$	15,336

Schedule of fair value option

As of December 31, 2020 and 2019, the Company determined the fair value for the note, as compared to the face value, including accrued interest, as follows (in thousands):

	Fair Value at December 31,
	2020		2019
Yaskawa Note	$	15,392	$	16,169

Schedule of maturities of long-term debt

As of December 31, 2020, the scheduled maturity on the development loans, revolving credit facility and promissory note was as follows (in thousands):

Year Ending December 31,	Amount
2021	$	20,153
2022	15,748
Thereafter	—
Total	$	35,901