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Stock Options
 3 Months Ended
Mar. 31, 2020
Share-based Payment Arrangement [Abstract]  
Stock Options
11. Stock Options
2015 Stock Option
In 2015, the Company issued a stock option (2015 Stock Option) to purchase 559 shares of common stock at an exercise price of approximately $0.21 per share. The value of the 2015 Stock Option at the date of grant was $0.07 per share based on a life of 7.0 years, a risk-free interest rate of 2.01% and expected volatility of 157.1%. The 2015 Stock Option was the only stock option outstanding as of March 31, 2020 and 2019.
After July 9, 2019, the 2015 Stock Option became fully exercisable. Prior to that date it could only be exercised based on the occurrence of certain events. The 2015 Stock Option terminates on earlier to occur of July 9, 2022, or the occurrence of certain corporate transactions.