Shareholders' Equity (Tables)

3 Months Ended

Mar. 31, 2018

Equity [Abstract]

Schedule of shares of Class A common stock reserved for future issuance

Stock options and grants outstanding under incentive plans	148
Common stock warrants outstanding - derivative liability	43,015
Common stock warrants outstanding - equity security	7,538,846
Total shares reserved for future issuance	7,582,009