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Stock-based Compensation (Tables) | 6 Months Ended
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Dec. 31, 2019
Share-based Payment Arrangement [Abstract] |
Schedule of assumptions used to estimate fair value of stock options granted using Black-Scholes option pricing model | The fair value of stock option grants for the three and six months ended December 31, 2019 and 2018 was estimated on the date of grant using the Black-Scholes option pricing model with the following assumptions:
| Three Months Ended December 31, |  | Six Months Ended December 31,
| 2019 |  | 2018 |  | 2019 |  | 2018
Risk-free interest rate | 1.72 | % |  | 2.97 | % |  | 1.58% - 1.72% |  |  | 2.87% - 2.97% |
Expected term | 6.27 years |  |  | 6.05 years |  |  | 6.27 years |  |  | 6.05 years |
Dividend yield | — | % |  | — | % |  | — | % |  | — | %
Volatility | 49.74 | % |  | 50.02 | % |  | 49.74% - 50.04% |  |  | 47.34% - 50.02% |
Weighted-average fair value | $ | 10.30 |  |  | $ | 6.62 |  |  | $ | 9.14 |  |  | $ | 8.77 |
Schedule of stock-based compensation expense | The following table shows total stock-based compensation expense included in the condensed consolidated statements of operations for the three and six months ended December 31, 2019 and 2018 (in thousands):
| Three Months Ended December 31, |  | Six Months Ended December 31,
| 2019 |  | 2018 |  | 2019 |  | 2018
Cost of sales | $ | 384 |  |  | $ | 428 |  |  | $ | 779 |  |  | $ | 866 |
Research and development | 3,126 |  |  | 3,212 |  |  | 6,256 |  |  | 6,708 |
Sales and marketing | 423 |  |  | 436 |  |  | 859 |  |  | 941 |
General and administrative | 1,031 |  |  | 1,171 |  |  | 2,124 |  |  | 2,606 |
Stock-based compensation expense before taxes | 4,964 |  |  | 5,247 |  |  | 10,018 |  |  | 11,121 |
Income tax impact | (1,131 | ) |  | (1,082 | ) |  | (2,283 | ) |  | (2,324 | )
Stock-based compensation expense, net | $ | 3,833 |  |  | $ | 4,165 |  |  | $ | 7,735 |  |  | $ | 8,797 |
Summary of stock option activity | The following table summarizes stock option activity during the six months ended December 31, 2019 under all plans:
|  | Options Outstanding |  | Weighted Average Exercise Price per Share |  | Weighted Average Remaining Contractual Term (in Years)
Balance as of June 30, 2019 |  | 7,374,635 |  |  | $ | 18.02 |  |  |
Granted |  | 160,600 |  |  | $ | 18.44 |  |  |
Exercised |  | (288,985 | ) |  | $ | 14.04 |  |  |
Forfeited/Cancelled |  | (358,006 | ) |  | $ | 8.69 |  |  |
Balance as of December 31, 2019 |  | 6,888,244 |  |  | $ | 18.68 |  |  | 3.77
Options vested and exercisable at December 31, 2019 |  | 6,152,154 |  |  | $ | 18.46 |  |  | 3.19
Summary of restricted stock unit activity | The following table summarizes RSUs and PRSUs activity during the six months ended December 31, 2019 under all plans:
| Time-Based RSUs Outstanding |  | Weighted Average Grant-Date Fair Value per Share |  | PRSUs Outstanding |  |  | Weighted Average Grant-Date Fair Value per Share
Balance as of June 30, 2019 | 1,873,102 |  |  | $ | 20.25 |  |  | 120,000 |  | (1) |  | $ | 27.10 |
Granted | 571,200 |  |  | $ | 18.91 |  |  | — |  |  |  |
Released (2) | (508,979 | ) |  | $ | 20.96 |  |  | — |  |  |  |
Forfeited | (86,559 | ) |  | $ | 18.49 |  |  | — |  |  |  |
Balance as of December 31, 2019 | 1,848,764 |  |  | $ | 19.72 |  |  | 120,000 |  |  |  | $ | 27.10 |
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(1) | Reflects the number of PRSUs that have been earned based on the achievement of performance metrics.
(2) | The number of shares released excludes 96,000 PRSUs that were vested but not released as of December 31, 2019, of which 6,000 PRSUs vested during the three months ended December 31, 2019.

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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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