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Stock-Based Compensation Expense - Additional Information (Detail) - USD ($) |  | 6 Months Ended |
--- | --- | --- | ---
Mar. 15, 2017 | Jun. 30, 2017 | Mar. 16, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period |  | 4 years |
Number of common stock repurchased |  | 9,534 |
Purchase price of common stock by employees (as a percent) |  | 85.00% |
Employee Stock Purchase Plan [Member] | Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Employee withholding percentage |  | 15.00% |
Restricted Stock And Restricted Stock Units [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized compensation expense |  | $ 30,577,992 |
Unrecognized compensation expense, recognition period |  | 2 years 11 months 16 days |
Options to Purchase Common Stock [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized compensation expense, recognition period |  | 2 years 10 months 24 days |
Unrecognized compensation cost, stock options |  | $ 14,100,000 |
Stock options vested, fair value |  | $ 3,200,000 |
Stock options granted, weighted-average grant date fair value |  | $ 6.65 |
Employee Stock [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Common stock issued to employees (in shares) | 138,085 |  |
Aggregate proceeds from issuance of common stock to employees | $ 1,500,000 |  |
Share issued, price per share (in dollars per share) | $ 12.79 |  | $ 10.60
Closing price of shares issued (in dollars per share) | $ 15.05 |  | $ 12.47

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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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