Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2018

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Schedule of Restricted Stock Units Activity

A summary of the activity and related information of the restricted stock units issued during the year ended December 31, 2018 is presented below:

	Restricted Stock Units			Weighted Average Grant Date Fair Value
Outstanding at December 31, 2017		—		$	—
Granted		1,502,666			26.86
Forfeited		(8,555	)		16.99
Outstanding at December 31, 2018		1,494,111		$	26.91

Schedule of Stock-based Compensation Expense Recorded in Operating Expenses

Stock-based compensation expense recorded in operating expenses was as follows (in thousands):

	Year ended December 31,
	2018		2017
Selling, general and administrative	$	11,936	$	8,744
Research and development		1,951		3,258
Stock-based compensation in operating    expenses	$	13,887	$	12,002

Communicated Option Awards [Member]

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Schedule of Options Activity

A summary of the activity and related information of the Communicated Option Awards is presented below:

	Liability- Classified Awards (in shares)			Weighted Average Exercise Price		Weighted Average Remaining Life (in years)		Aggregate Intrinsic Value (in thousands)
Outstanding at December 31, 2016		654,500		$	2.22		5.05	$	3,781
Granted		394,000			7.35	6.02
Forfeited		(115,000	)		6.00		—
Outstanding at December 31, 2017		933,500		$	3.92		4.86	$	19,676
Granted		170,000			25.00		—
Forfeited		(67,000	)		5.33		—
Cancelled and settled with Replacement    Awards		(1,036,500	)		7.29		—		22,442
Outstanding at December 31, 2018		—		$	—		—	$	—
Exercisable at December 31, 2018		—		$	—		—	$	—
Vested and expected to vest at December 31,    2018		—		$	—		—	$	—

Schedule of Fair Value of Options Using the Black Scholes Option Pricing Model and Assumptions Used

The fair value of the Communicated Option Awards classified as liabilities was estimated using the Black Scholes option pricing model and the weighted-average assumptions used in the model are noted in the following table:

	Year ended December 31,
	2018			2017
Risk-free interest rate		2.49	%		1.96	%
Volatility		34.13	%		43.70	%
Expected dividend yield		0.00	%		0.00	%
Expected life		2.9			2.6

Stock Options [Member]

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Schedule of Options Activity

A summary of the activity and related information of the stock options issued during the year ended December 31, 2018 is presented below:

	Stock Options			Weighted Average Exercise Price		Weighted Average Remaining Life (in years)		Aggregate Intrinsic Value (in thousands)
Outstanding at December 31, 2017		—		$	—		—	$	—
Granted		1,945,900			28.47	9.43
Forfeited		(25,800	)		19.27		—
Outstanding at December 31, 2018		1,920,100		$	28.59		9.43	$	—
Exercisable at December 31, 2018		80,499		$	28.94		9.42	$	—
Vested and expected to vest at December 31,    2018		1,920,100		$	28.94		9.43	$	—

Schedule of Fair Value of Options Using the Black Scholes Option Pricing Model and Assumptions Used

The fair value of the stock options issued under the 2018 Plan was estimated using the Black Scholes option pricing model and the weighted-average assumptions used in the model are noted in the following table:

	Year ended December 31, 2018
Risk-free interest rate	2.89		%
Volatility	42.64		%
Expected dividend yield		0.00	%
Expected life		6.5