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Common shares, preferred shares and warrants - Additional Information (Detail) |  |  |  |  |  | 1 Months Ended | 12 Months Ended | 17 Months Ended |  |  |
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Oct. 17, 2018 USD ($) | Apr. 09, 2018 USD ($) shares | Jan. 10, 2018 USD ($) $ / shares shares | Nov. 03, 2017 USD ($) $ / shares shares | Jun. 08, 2016 shares | Nov. 30, 2017 USD ($) $ / shares | Oct. 31, 2017 USD ($) $ / shares shares | Nov. 30, 2016 investor $ / shares shares | May 31, 2016 investor $ / shares shares | Dec. 31, 2018 USD ($) investor $ / shares shares | Dec. 31, 2017 USD ($) investor $ / shares shares | Oct. 17, 2017 $ / shares | Jul. 09, 2018 $ / shares | Nov. 02, 2017 $ / shares | Dec. 31, 2016 USD ($) shares
Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares issued (in shares) |  |  |  |  |  |  |  |  |  | 76,525,581 | 61,631,573 |  |  |  | 53,717,996
Treasury stock, shares (in shares) |  |  |  |  |  |  |  |  |  | 1,233,198 | 352,523 |  |  |  | 160,235
Proceeds from issuance of shares, net of issuance costs | $ |  |  |  |  |  |  |  |  |  | $ 13,392,000 | $ 0 |  |  |  |
Proceeds from exercise of warrants by certain warrant holders | $ |  |  |  |  |  |  |  |  |  | 0 | 3,485,000 |  |  |  |
Treasury stock, value | $ |  |  |  |  |  |  |  |  |  | $ 3,272,000 | $ 1,274,000 |  |  |  | $ 531,000
Preferred stock, shares authorized (in shares) |  |  |  |  |  |  |  |  |  | 10,000,000 | 10,000,000 |  |  |  |
Preferred stock, par value (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  | $ 0.0001 | $ 0.0001 |  |  |  |
Preferred stock, shares issued (in shares) |  |  |  |  |  |  |  |  |  | 0 | 0 |  |  |  |
Preferred stock, shares outstanding (in shares) |  |  |  |  |  |  |  |  |  | 0 | 0 |  |  |  |
Certain Investors |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price of warrants (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 3.00 |  |  |  |
Number of common stock shares that warrants to purchase (in shares) |  |  |  |  |  |  |  |  |  |  | 1,161,769 |  |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of common stock issued |  |  |  |  |  |  |  |  |  | 2,700,000 |  |  |  |  |
Registered Direct Offering |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price of warrants (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  | $ 8.00 |  |  |  |  |  |
Warrants outstanding (in shares) |  |  |  |  |  |  |  |  | 500,000 |  |  |  |  |  |
Warrants exercise period |  |  |  |  |  |  |  |  | 6 months |  |  |  |  |  |
Warrants expiration period |  |  |  |  |  |  |  |  | 24 months |  |  |  |  |  |
Registered Direct Offering | Certain Investors |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price of warrants (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 3.75 |  |  |  |  |  |  |
Warrants outstanding (in shares) |  |  |  |  |  |  |  | 1,000,000 |  |  |  |  |  |  |
Warrants exercise period |  |  |  |  |  |  |  | 6 months |  |  |  |  |  |  |
Warrants expiration period |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |
Registered Direct Offering | Related Agents |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price of warrants (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 5.00 |  |  |  |  |  |  |
Warrants outstanding (in shares) |  |  |  |  |  |  |  | 100,000 |  |  |  |  |  |  |
Number of investors | investor |  |  |  |  |  |  |  | 4 |  |  |  |  |  |  |
Warrants exercise period |  |  |  |  |  |  |  | 6 months |  |  |  |  |  |  |
Warrants expiration period |  |  |  |  |  |  |  | 24 months |  |  |  |  |  |  |
Whitehorse Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued from vesting |  |  |  |  |  |  |  |  |  |  | 300,000 |  |  |  |
Exercise price of warrants (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  | $ 3.00 |  |  |  | $ 5.08 |
Proceeds from exercise of warrants by certain warrant holders | $ |  |  |  | $ 900,000 |  |  |  |  |  |  | $ 3,484,000 |  |  |  |
Warrants outstanding (in shares) |  |  |  | 300,000 |  |  |  |  |  |  |  |  |  |  |
Minimum share price to transfer common stock underlying warrants (in dollars per share) | $ / shares |  |  |  | $ 4.50 |  | $ 4.5 |  |  |  |  |  |  | $ 3.8334 |  |
Whitehorse Warrants | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from exercise of warrants by certain warrant holders | $ |  |  |  |  |  | $ 900,000 |  |  |  |  |  |  |  |  |
Warrants Issued To Institutional Investor |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants outstanding (in shares) |  |  |  |  |  |  |  |  |  |  | 833,333 |  |  |  |
Intracoastal and Anson |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of common stock issued |  |  |  |  |  |  | 861,769 |  |  |  |  |  |  |  |
Exercise price of warrants (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 3.00 |  |  |  |  | $ 3 |  |  |
Number of common stock shares that warrants to purchase (in shares) |  |  |  |  |  |  |  |  | 375,000 |  |  |  |  |  |
Loss recognized into other expenses, net | $ |  |  |  |  |  |  |  |  |  |  | $ 1,005,000 |  |  |  |
Proceeds from exercise of warrants by certain warrant holders | $ |  |  |  |  |  |  | $ 2,585,000 |  |  |  |  |  |  |  |
Warrants outstanding (in shares) |  |  |  |  |  |  | 861,769 |  |  |  | 125,000 |  |  |  |
Number of investors | investor |  |  |  |  |  |  |  |  | 5 |  |  |  |  |  |
Intracoastal and Anson | Certain Investors |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price of warrants (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 3.00 |  | $ 3.75 |  |  |  |  |
Warrants outstanding (in shares) |  |  |  |  |  |  |  | 166,667 |  | 2,498,776 | 1,273,776 |  |  |  | 2,220,102
Number of investors | investor |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |
Intracoastal and Anson | Related Agents |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price of warrants (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  | $ 5.00 |  |  |  |  |
Warrants outstanding (in shares) |  |  |  |  |  |  |  |  |  | 100,000 |  |  |  |  |
Intracoastal and Anson | Additional Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of additional warrant rights |  |  |  |  |  |  |  |  |  |  |  | 25.00% |  |  |
Exercise price of warrants (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 5.35 |  |  |  |
Number of common stock shares that warrants to purchase (in shares) |  |  |  |  |  |  |  |  |  |  | 215,443 |  |  |  |
Number of investors | investor |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |
Q Interactive​, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued related to merger (in shares) |  |  |  | 2,750,000 |  |  |  |  |  |  |  |  |  |  |
Q Interactive​, LLC | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued related to merger (in shares) |  |  |  |  | 2,369,190 |  |  |  |  |  |  |  |  |  |
Restricted Stock Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued from vesting |  |  |  |  |  |  |  |  |  | 12,194,008 |  |  |  |  |
Number of units, withheld as treasury stock (in shares) |  |  |  |  |  |  |  |  |  | 875,675 | 192,288 |  |  |  |
Restricted Stock Units and Restricted Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued from vesting |  |  |  |  |  |  |  |  |  |  | 4,001,808 |  |  |  |
Common shares withheld to cover withholding taxes |  |  |  |  |  |  |  |  |  |  | 192,288 |  |  |  |
Number of units, withheld as treasury stock (in shares) |  |  |  |  |  |  |  |  |  | 875,675 | 192,288 |  |  |  |
Registered Direct Offering | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of common stock issued |  |  | 2,700,000 |  |  |  |  |  |  |  |  |  |  |  |
Common stock purchase price per share (in dollars per share) | $ / shares |  |  | $ 5.00 |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of shares, net of issuance costs | $ |  |  | $ 13,392,000 |  |  |  |  |  |  |  |  |  |  |  |
Payments of stock issuance costs | $ |  |  | $ 108,000 |  |  |  |  |  |  |  |  |  |  |  |
Registered Direct Offering | Warrant |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of common stock issued |  |  | 1,350,000 |  |  |  |  |  |  |  |  |  |  |  |
Exercise price of warrants (in dollars per share) | $ / shares |  |  | $ 6.00 |  |  |  |  |  |  |  |  |  |  |  |
Accelerated Vesting Of Restricted Stock Unit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury stock, shares acquired |  | 729,167 |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury stock, acquired, cost method | $ | $ 5,000 | $ 1,581,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Put Rights | Whitehorse Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price of warrants (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  | $ 3.8334 |  |
Minimum | Intracoastal and Anson | Certain Investors |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price of warrants (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  | $ 3.75 |  |  |  |  |
Maximum | Intracoastal and Anson | Certain Investors |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price of warrants (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  | $ 6.00 |  |  |  |  |

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