Shareholders' Equity and Share-based Compensation (Tables)

9 Months Ended

Mar. 31, 2018

Stock Options

The Company did not grant any stock options during the nine months ended March 31, 2018. The number of options expected to vest is the result of applying the pre-vesting forfeiture rate assumption to total outstanding options.

The following table summarizes the Company's stock option activities for the nine months ended March 31, 2018:



					Weighted
			Weighted		Average
			Average		Remaining
	Number of		Exercise Price		Contractual	Aggregate
	Shares		Per Share		Term (in years)	Intrinsic Value
Outstanding at June 30, 2017	1,053,367		$	10.98	4.43	$	6,212,660
Exercised	(133,514	)	$	10.90		$	818,624
Outstanding at March 31, 2018	919,853		$	10.99	4.19	$	4,521,710
Options vested and expected to vest	919,821		$	10.99	4.19	$	4,521,497
Exercisable at March 31, 2018	916,936		$	11.00	4.19	$	4,502,312

Restricted Stock Units Activity

Restricted Stock Units ("RSUs")

The following table summarizes the Company's RSU activities for the nine months ended March 31, 2018:



	Number of Restricted Stock Units		Weighted Average Grant Date Fair Value Per Share		Weighted Average Remaining Recognition Period (Years)	Aggregate Intrinsic Value
Nonvested at June 30, 2017	1,144,865		$	14.11	1.76	$	19,084,900
Granted	745,071		$	16.40
Vested	(473,657	)	$	13.58
Forfeited	(63,403	)	$	14.04
Nonvested at March 31, 2018	1,352,876		$	15.56	1.95	$	20,901,934
RSUs vested and expected to vest	1,177,238				1.87	$	18,188,334

The fair value of RSU is based on the market price of the Company's share on the date of grant.

Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions [Table Text Block]

Employee Share Purchase Plan ("ESPP")

The assumptions used to estimate the fair values of common shares issued under the ESPP were as follows:




	Nine Months Ended March 31,
	2018
Volatility rate	45.32%
Risk-free interest rate	1.4% - 1.7%
Expected term	1.3 years
Dividend yield	0%

Share-based Compensation, Allocation of Recognized Period Costs

Share-based Compensation Expense

The total share-based compensation expense related to stock options, RSUs and ESPP described above, recognized in the condensed consolidated statements of operations for the periods presented was as follows:



	Three Months Ended March 31,				Nine Months Ended March 31,
	2018		2017		2018		2017
	(in thousands)				(in thousands)
Cost of goods sold	$	449	$	222	$	1,180	$	622
Research and development	361		395		1,340		1,138
Selling, general and administrative	1,650		1,098		5,957		2,825
	$	2,460	$	1,715	$	8,477	$	4,585