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Debts (Tables)
 3 Months Ended
Mar. 31, 2021
Debt Disclosure [Abstract]  
Schedule of promissory note obligation
The Company’s stated value of promissory note obligation as of the dates presented consists of the following (in thousands):
December 31,
Interest RateDue DateMarch 31, 202120202019
Yaskawa Note1.00%September 2022$15,523 $15,486 $15,336 
Schedule of fair value option As of the dates presented, the Company determined the fair value for the note, as compared to the face value, including accrued interest, as follows (in thousands):
December 31,
March 31, 202120202019
Yaskawa Note$16,128 $15,392 $16,169 
Schedule of maturities of long-term debt As of March 31, 2021, the scheduled maturity on the development loans, revolving credit facility and promissory note was as follows (in thousands):
2022$20,150 
202315,748 
Thereafter— 
Total$35,898