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Stockholders' Equity (Deficit) (Tables)

12 Months Ended

Dec. 31, 2019

Equity [Abstract]

Schedule of Key Assumptions Used to Determine Fair Value of Options Granted

The weighted-averages for key assumptions used in determining the fair value of stock options granted were as follows:

	Year Ended December 31,
	2019		2018
Volatility	59.32%		57.76%
Risk-free interest rate	2.42%		2.65%
Expected life (years)	6.17		6.24
Dividend yield rate	—%		—%

Schedule of Stock Options Activity

A summary of stock option activity under the Plan for the year ended December 31, 2019, is presented below:

								Weighted
				Weighted				Average
				Average				Remaining		Aggregate
	Stock			Exercise				Contractual		Intrinsic
	Options			Per Share				Terms (Years)		Value
Outstanding, December 31, 2018	3,257,801			$	11.99			9.26		$	7,119
Granted	1,321,451			$	18.63
Exercised	(273,734	)		$	9.98
Cancelled/forfeited	(328,117	)		$	15.15
Outstanding, December 31, 2019	3,977,401			$	14.07			8.51		$	7,198
Exercisable, December 31, 2019	800,595			$	12.50			8.28		$	1,880
Vested and expected to vest, December 31, 2019	3,977,401			$	14.07			8.51		$	7,198

Schedule of RSUs Activity

A summary of RSUs activity under the Plan for the year ended December 31, 2019, is presented below:

				Weighted
	Restricted			Average
	Stock			Grant Date
	Units			Fair Value
Outstanding, December 31, 2018	271,404			$	16.53
Granted	3,000			$	18.33
Vested	(25,125	)		$	24.81
Forfeited	(19,409	)		$	13.71
Outstanding, December 31, 2019	229,870			$	15.89

Schedule of Stock-based Compensation Expense

The following table summarizes stock-based compensation expense arising from the above Plan:

	Year Ended December 31,
	2019				2018
Selling, general and administrative	$	8,862			$	5,570
Research and development	656				1,401
Total stock-based compensation expense	$	9,518			$	6,971

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Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement.

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Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year.

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Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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