Net Loss Per Share -AntiDilutive Common Share Equivalents (Details) - shares	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti–dilutive common share equivalents (in shares)	1,943,677	1,884,404
Stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti–dilutive common share equivalents (in shares)	330,590	410,506
Restricted stock awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti–dilutive common share equivalents (in shares)	709,444	1,473,898
Restricted stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti–dilutive common share equivalents (in shares)	903,643	0