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STOCKHOLDERS' EQUITY (Tables) | 12 Months Ended
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Jun. 30, 2021
STOCKHOLDERS' EQUITY |
Schedule of stock-based compensation expense in the consolidated statements of operations | We recorded stock-based compensation expense in the consolidated statements of operations as follows (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2019 |  | 2020 |  | 2021
Cost of goods sold | ​ | $ | 732 | ​ | $ | 708 | ​ | $ | 760
Selling, general and administrative | ​ |  | 23,876 | ​ |  | 22,546 | ​ |  | 25,457
Research and development | ​ |  | 643 | ​ |  | 563 | ​ |  | 554
Stock-based compensation expense | ​ | $ | 25,251 | ​ | $ | 23,817 | ​ | $ | 26,771
Schedule of weighted average assumptions used to determine the fair value calculations for stock options issued | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2019 |  | 2020 |  | 2021 |
Expected dividend |  | — | ​ | — | ​ | — | ​
Risk-free interest rate |  | 2.6 | % | 1.6 | % | 0.4 | %
Expected volatility |  | 28.0 | % | 26.0 | % | 26.0 | %
Expected holding period (in years) |  | 4.5 | ​ | 4.5 | ​ | 4.5 | ​
Summary of stock option activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted- | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Average | ​ | Weighted-Average | ​ | Aggregate
​ | ​ | Number of | ​ | Exercise | ​ | Remaining Contractual | ​ | Intrinsic Value
​ |  | Options |  | Price |  | Term |  | (in thousands)
Outstanding at June 30, 2018 |  | 677,525 |  | ​ | 32.80 | ​ | ​ | ​ | ​ | ​
Granted |  | 19,259 |  | ​ | 73.37 | ​ | ​ | ​ | ​ | ​
Exercised |  | (169,799) |  | ​ | 32.11 | ​ | ​ | ​ | ​ | ​
Expired or forfeited |  | (11,101) |  | ​ | 70.50 | ​ | ​ | ​ | ​ | ​
Outstanding at June 30, 2019 |  | 515,884 |  | $ | 33.74 | ​ | ​ | ​ | ​ | ​
Granted |  | 13,263 |  | ​ | 101.31 | ​ | ​ | ​ | ​ | ​
Exercised |  | (201,150) |  | ​ | 20.48 | ​ | ​ | ​ | ​ | ​
Expired or forfeited |  | (1,693) |  | ​ | 81.79 | ​ | ​ | ​ | ​ | ​
Outstanding at June 30, 2020 |  | 326,304 |  | $ | 44.41 |  | ​ | ​ | ​ | ​
Granted |  | 22,171 | ​ | ​ | 82.17 | ​ | ​ | ​ | ​ | ​
Exercised |  | (88,657) | ​ | ​ | 35.19 | ​ | ​ | ​ | ​ | ​
Expired or forfeited |  | (4,598) | ​ | ​ | 80.46 | ​ | ​ | ​ | ​ | ​
Outstanding at June 30, 2021 |  | 255,220 | ​ | $ | 50.24 | ​ | 2.5 years | ​ | $ | 13,118
Exercisable at June 30, 2021 | ​ | 221,090 | ​ | $ | 44.80 |  | 1.5 years | ​ | $ | 12,567
Summary of RSU award activity | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted-
​ | ​ | ​ | ​ | Average
​ |  | Shares |  | Fair Value
Nonvested at June 30, 2018 |  | 526,377 | ​ | $ | 71.56
Granted |  | 375,580 | ​ |  | 74.40
Vested |  | (364,410) | ​ |  | 70.92
Forfeited |  | (16,407) | ​ |  | 74.13
Nonvested at June 30, 2019 |  | 521,140 | ​ | $ | 73.97
Granted |  | 308,431 | ​ |  | 87.88
Vested |  | (390,613) | ​ |  | 68.63
Forfeited |  | (15,368) | ​ |  | 83.36
Nonvested at June 30, 2020 |  | 423,590 | ​ | $ | 88.68
Granted |  | 339,311 | ​ | ​ | 80.40
Vested |  | (313.892) | ​ | ​ | 86.12
Forfeited |  | (13,084) | ​ | ​ | 85.78
Nonvested at June 30, 2021 |  | 435,925 | ​ | $ | 84.16

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- Definition 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. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + 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 (c)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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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=120381028&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=120381028&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=120381028&loc=d3e5070-113901 + Details
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- Definition 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. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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