Net Loss per Share (Details) - shares	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Number of antidilutive securities excluded from computation of earnings per share	12,028,762	14,329,446
Restricted Stock Units (RSUs) [Member]
Number of antidilutive securities excluded from computation of earnings per share	1,865,081	1,665,765
Unvested Restricted Stock [Member]
Number of antidilutive securities excluded from computation of earnings per share	624,116	624,116
Earnout Shares [Member]
Number of antidilutive securities excluded from computation of earnings per share		2,500,000
Stock Warrants [Member]
Number of antidilutive securities excluded from computation of earnings per share	9,539,565	9,539,565