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Stock-Based Compensation - Additional Information (Details) |  |  |  | 1 Months Ended | 3 Months Ended
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Apr. 17, 2018 Installment shares | Nov. 29, 2017 shares | Oct. 11, 2017 shares | May 31, 2018 $ / shares shares | Mar. 31, 2019 USD ($) $ / shares shares | Mar. 31, 2018 USD ($) shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Recognized stock-based compensation expense | $ |  |  |  |  | $ 663,000 | $ 1,181,000
Options Issued and Outstanding |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Number of options exercised |  |  |  |  | 0 |
Options Issued and Outstanding | Employees and Directors |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Option granted |  |  |  |  | 594,600 |
Weighted-average grant date fair value of options granted | $ / shares |  |  |  |  | $ 6.65 |
Expense related to options granted | $ |  |  |  |  | $ 600,000 | 300,000
Unrecognized compensation expense | $ |  |  |  |  | $ 10,700,000 |
Unrecognized compensation expense, estimated weighted-average period for recognition |  |  |  |  | 3 years 3 months 18 days |
Options Issued and Outstanding | Non-employees |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Option granted |  |  |  |  | 9,840 |
Weighted-average grant date fair value of options granted | $ / shares |  |  |  |  | $ 5.79 |
Expense related to options granted | $ |  |  |  |  | $ 7,000 | 3,000
Unrecognized compensation expense | $ |  |  |  |  | $ 200,000 |
Unrecognized compensation expense, estimated weighted-average period for recognition |  |  |  |  | 2 years 11 months 26 days |
Restricted Stock |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Unrecognized compensation expense, estimated weighted-average period for recognition |  |  |  |  | 18 days |
Shares granted | 2,000 |  |  |  |  |
Number of quarterly installment in which restriction lapse | Installment | 4 |  |  |  |  |
Recognized stock-based compensation expense | $ |  |  |  |  | $ 1,000 | $ 900,000
Unrecognized stock-based compensation expense | $ |  |  |  |  | $ 159,000 |
Restricted Stock Units |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Unrecognized compensation expense, estimated weighted-average period for recognition |  |  |  |  | 3 years 1 month 20 days |
Shares granted |  |  |  |  | 0 |
Recognized stock-based compensation expense | $ |  |  |  |  | $ 14,000 |
Unrecognized stock-based compensation expense | $ |  |  |  |  | $ 200,000 |
Restricted Stock Units | Non-employees |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Shares granted |  |  |  |  |  | 0
Restricted Stock Units | Employees |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Shares granted |  |  |  | 24,960 |  | 0
Weighted-average grant date fair value | $ / shares |  |  |  | $ 9.03 |  |
2017 Stock Incentive Plan |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Number of shares reserved for issuance |  | 630,662 | 537,914 |  | 537,914 |
Number of additional shares reserved for issuance |  | 1,866,009 | 630,662 |  |  |
2017 Stock Incentive Plan | Maximum |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Terms of stock based options granted |  |  |  |  | 10 years |
2018 Stock Incentive Plan |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Percentage of additional shares added on outstanding shares |  |  |  |  | 4.00% |
2018 Stock Incentive Plan | Minimum [Member] |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Number of shares reserved for issuance |  |  |  |  | 2,200,260 |
2018 Stock Incentive Plan | Maximum |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Number of shares reserved for issuance |  |  |  |  | 3,322,473 |
2018 Employee Stock Purchase Plan |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Number of shares reserved for issuance |  |  |  |  | 275,030 |
Percentage of additional shares added on outstanding shares |  |  |  |  | 1.00% |
2018 Employee Stock Purchase Plan | Minimum [Member] |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Number of additional shares reserved for issuance |  |  |  |  | 543,926 |
2018 Employee Stock Purchase Plan | Maximum |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Number of additional shares reserved for issuance |  |  |  |  | 555,583 |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: 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=109197908&loc=d3e5047-113901 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 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation. + 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 (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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)(iii)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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)(iii)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + 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 (a)(3) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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