Stock-Based Compensation (Tables)

9 Months Ended

12 Months Ended

Sep. 30, 2017

Dec. 31, 2016

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

The fair value of the options was estimated at the date of grant using the following assumptions:



Expected volatility	45		%
Expected dividends	$	—
Expected term (in years)	6.25
Risk free rate	1.83		%

The fair value of the options was estimated at the date of grant using the following assumptions:



Expected volatility	45		%
Expected dividends	$	—
Expected term (in years)	6.25
Risk free rate	1.35		%

The fair value of each stock option award granted is estimated on the date of grant using the Black- Scholes option-pricing model. The fair value of the options was estimated at the date of grant using the following assumptions:



Expected volatility	18		%
Expected dividends	$	—
Expected term (in years)	6.25
Risk free rate	2.23		%

The fair value of the options was estimated at the date of grant using the following assumptions:



Expected volatility	55		%
Expected dividends	$	—
Expected term (in years)	5.8
Risk free rate	1.22		%

The fair value of the options was estimated at the date of grant using the following assumptions:



Expected volatility	45		%
Expected dividends	$	—
Expected term (in years)	6.25
Risk free rate	1.83		%

The fair value of the options was estimated at the date of grant using the following assumptions:



Expected volatility	55		%
Expected dividends	$	—
Expected term (in years)	5.8
Risk free rate	1.22		%

The fair value of the options was estimated at the date of grant using the following assumptions:



Expected volatility	45		%
Expected dividends	$	—
Expected term (in years)	6.25
Risk free rate	1.35

Schedule of stock options, activity

A summary of the stock option activity for the nine months ended September 30, 2017 and the year ended December 31, 2016, is presented below.



	Number of Shares		Weighted Average Exercise Price		Weighted Average Grant-Date Fair Value
Outstanding at January 1, 2016	3,485,791		$	3.96	$	1.77
Granted	1,274,549		$	2.25	$	1.77
Exercised	—		$	—	$	—
Forfeited	(114,456	)	$	3.96	$	1.77
Expired	—		$	—	$	—
Canceled	—		$	—	$	—
Outstanding at December 31, 2016	4,645,884		$	3.49	$	1.77
Exercisable at December 31, 2016	2,354,466		$	3.77	$	1.77

Outstanding at January 1, 2017	4,645,884		$	3.49	$	1.77
Granted	793,738		$	14.00	$	3.35
Exercised	(226,194	)	$	3.96	$	1.77
Forfeited	(5,148	)	$	14.00	$	3.35
Expired	—		$	—	$	—
Canceled	(571,927	)	$	3.96	$	1.77
Outstanding at September 30, 2017	4,636,353		$	5.20	$	2.04
Exercisable at September 30, 2017	3,847,763		$	3.39	$	1.77

A summary of the stock option activity for the years ended December 31, 2016 and 2015 is presented below.



	Number of Shares		Weighted Average Exercise Price		Weighted Average Grant‑Date Fair Value
Outstanding at January 1, 2015	3,485,791		$	3.96	$	1.77
Granted	—		$	—	$	—
Exercised	—		$	—	$	—
Forfeited	—		$	—	$	—
Expired	—		$	—	$	—
Outstanding at December 31, 2015	3,485,791		$	3.96	$	1.77
Exercisable at December 31, 2015	1,399,704		$	3.96	$	1.77
Outstanding at January 1, 2016	3,485,791		$	3.96	$	1.77
Granted	1,274,549		$	2.25	$	1.77
Exercised	—		$	—	$	—
Forfeited	(114,456	)	$	3.96	$	1.77
Expired	—		$	—	$	—
Outstanding at December 31, 2016	4,645,884		$	3.49	$	1.77
Exercisable at December 31, 2016	2,354,466		$	3.77	$	1.77

Schedule of RSUs, activity

The following table summarizes RSUs activity during the nine months ended September 30, 2017:



	Number of Shares		Weighted Average Grant Date Fair Value
Outstanding at January 1, 2017	372,335		$	3.89
Granted	691,585		$	13.65
Vested	—		$	—
Exercised	—		$	—
Forfeited	(1,170	)	$	13.65
Expired	—		$	—
Canceled	(372,335	)	$	3.89
Outstanding at September 30, 2017	690,415		$	13.65

Schedule of performance shares, activity

The following table summarizes information about the performance stock units that were outstanding at September 30, 2017:



Period Granted	Target Shares Outstanding at Beginning of Period	Target Shares Granted	Target Shares Vested	Target Shares Forfeited	Target Shares Outstanding at End of Period	Weighted Average Grant Date Fair Value per Share
2017	—	169,635	—	—	169,635	$	10.73

Total	—	169,635	—	—	169,635