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Stock-Based Compensation (Tables)

6 Months Ended

Sep. 30, 2018

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

The following table summarizes stock-based compensation expense by financial statement line item in the Company’s consolidated statements of operations for the three and six months ended September 30, 2018 and 2017:

	For the Three Months Ended September 30,				For the Six Months Ended September 30,
		2018		2017		2018		2017
	(in $000's)				(in $000's)
Cost of product revenue	$	774	$	372	$	1,349	$	731
Research and development		2,618		1,205		4,584		2,544
Selling, general and administrative		12,542		7,705		22,246		14,663
	$	15,934	$	9,282	$	28,179	$	17,938

Summary of Stock Option Activity

The following table summarizes the stock option activity for the six months ended September 30, 2018:

						Weighted
				Weighted		Average		Aggregate
				Average		Remaining		Intrinsic
	Options			Exercise		Contractual		Value
	(in thousands)			Price		Term (years)		(in thousands)
Outstanding at beginning of period		1,282		$	46.18		5.31
Granted		76			383.96
Exercised		(425	)		24.95
Cancelled and expired		(15	)		153.17
Outstanding at end of period		918		$	83.05		5.97	$	331,490
Exercisable at end of period		669		$	38.86		4.97	$	271,255
Options vested and expected to vest at end of period		905		$	82.85		5.94	$	327,147

Summary of Weighted Average Grant-Date Fair Values And Weighted Average Assumptions Used to Calculate Fair Value of Options Granted

The weighted average grant-date fair values and weighted average assumptions used in the calculation of fair value of options granted during the three and six months ended September 30, 2018 and 2017 was as follows:

	For the Three Months Ended September 30,						For the Six Months Ended September 30,
		2018			2017			2018			2017
Weighted average grant-date fair value	$	148.51		$	57.38		$	142.81		$	50.26

Valuation assumptions:
Risk-free interest rate		2.87	%		1.88	%		2.93	%		1.85	%
Expected option life (years)		3.99			4.06			4.04			4.07
Expected volatility		43.9	%		43.4	%		42.7	%		43.6	%

Summary of Restricted Stock Units Activity

The following table summarizes activity of restricted stock units for the six months ended September 30, 2018:

	Number of Shares			Weighted Average Grant Date Fair Value
	(in thousands)			(per share)
Restricted stock units at beginning of period		880		$	109.01
Granted		192		$	379.63
Vested		(404	)	$	103.91
Forfeited		(20	)	$	187.41
Restricted stock units at end of period		649		$	189.87