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Capital Stock - Common Stock Warrants - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions |  | 1 Months Ended
--- | --- | ---
May 07, 2018 | May 31, 2018 | Feb. 29, 2016 | Feb. 28, 2015
Loan and Security Agreement [Member] | Silicon Valley Bank [Member] | Warrants for Common Stock [Member] |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |
Aggregate number of unregistered shares of common stock called by warrants (in shares) | 6,332 |  |  |
Exercise price of warrants (in dollars per share) | $ 23.69 |  |  |
Exercisable period of warrants | 10 years |  |  |
Estimated fair value of warrants | $ 0.1 |  |  |
Five Year Warrants Issued in February 2016 [Member] | Third-Party Consultant [Member] |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |
Aggregate number of unregistered shares of common stock called by warrants (in shares) |  |  | 8,249 |
Exercise price of warrants (in dollars per share) |  |  | $ 15.40 |
Exercisable period of warrants |  |  | 5 years |
Warrants expiration period |  |  | 2021-02 |
Estimated fair value of warrants |  |  | $ 0.1 |
Five Year Warrants Issued in February 2015 [Member] | Hercules Loan [Member] |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |
Aggregate number of unregistered shares of common stock called by warrants (in shares) |  |  |  | 9,063
Exercise price of warrants (in dollars per share) |  |  |  | $ 66.20
Exercisable period of warrants |  |  |  | 5 years
Ten Year Warrants Issued in May 2018 [Member] | Loan and Security Agreement [Member] | Silicon Valley Bank [Member] | Warrants for Common Stock [Member] |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |
Aggregate number of unregistered shares of common stock called by warrants (in shares) |  | 6,332 |  |
Exercise price of warrants (in dollars per share) |  | $ 23.69 |  |
Exercisable period of warrants |  | 10 years |  |
Estimated fair value of warrants |  | $ 0.1 |  |

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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Fair value portion of warrants not settleable in cash classified as equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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