Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2019

Equity [Abstract]

Schedule of warrant activity

In connection with the issuance of debt, common stock and preferred stock, the Company has issued warrants to purchase shares of the Company's common stock. The following table summarizes warrant activity:

	Number of Warrants	Weighted Average Exercise Price per Warrant
Balance December 31, 2017	2,618,307	$	5.28
Granted, Arosa Loan Agreement	7,147,147
Granted, Marathon Credit Agreement	8,053,390
Exercised	—
Balance December 31, 2018	17,818,844	1.84
Granted, Series B Preferred Stock	9,262,500
Granted, Marathon Credit Agreement	3,379,466
Granted, Other	66,966
Exercised	—
Balance December 31, 2019	30,527,776	$	1.82