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Subsequent events (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 3 Months Ended |
--- | --- | --- | --- | ---
Jul. 24, 2019 | Jun. 30, 2019 | May 31, 2019 | Apr. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2019
Lessee, Operating Lease, Liability, Payment, Due [Abstract] |  |  |  |  |  |  |
Total remaining lease payments |  |  |  |  |  | $ 890 |
Stock Options [Member] |  |  |  |  |  |  |
Number of Stock Options [Abstract] |  |  |  |  |  |  |
Options, exercised (in shares) |  |  |  |  |  | (71,250) |
Expiration Date, April 2019 [Member] |  |  |  |  |  |  |
Warrants and Rights [Abstract] |  |  |  |  |  |  |
Expiration date | [1] |  |  |  |  | Apr. 30, 2019 |
Exercise price (in dollars per share) | [1] |  |  |  |  | $ 3.75 |
Expiration Date, July 2019 [Member] |  |  |  |  |  |  |
Warrants and Rights [Abstract] |  |  |  |  |  |  |
Expiration date |  |  |  |  |  | Jul. 24, 2019 |
Expiration Date, July 2019 [Member] | Minimum [Member] |  |  |  |  |  |  |
Warrants and Rights [Abstract] |  |  |  |  |  |  |
Exercise price (in dollars per share) |  |  |  |  |  | $ 3.75 |
Expiration Date, July 2019 [Member] | Maximum [Member] |  |  |  |  |  |  |
Warrants and Rights [Abstract] |  |  |  |  |  |  |
Exercise price (in dollars per share) |  |  |  |  |  | $ 12.25 |
Subsequent Event [Member] |  |  |  |  |  |  |
Lessee, Operating Lease, Liability, Payment, Due [Abstract] |  |  |  |  |  |  |
Total remaining lease payments |  |  |  |  |  |  | $ 1,107
Subsequent Event [Member] | Stock Options [Member] |  |  |  |  |  |  |
Number of Stock Options [Abstract] |  |  |  |  |  |  |
Options, exercised (in shares) |  |  |  | (15,000) |  |  |
Options, Exercise price (in dollars per share) |  |  |  | $ 1.29 |  |  |
Common stock shares issued on exercise of options (in shares) |  |  |  | 7,586 |  |  |
Subsequent Event [Member] | Expiration Date, April 2019 [Member] |  |  |  |  |  |  |
Warrants and Rights [Abstract] |  |  |  |  |  |  |
Expiration date |  |  |  |  | Apr. 30, 2019 |  |
Warrants expired (in shares) |  |  |  |  | (137,143) |  |
Exercise price (in dollars per share) |  |  |  |  | $ 3.75 |  |
Subsequent Event [Member] | Expiration Date, July 2019 [Member] |  |  |  |  |  |  |
Warrants and Rights [Abstract] |  |  |  |  |  |  |
Expiration date |  | Jul. 24, 2019 |  |  |  |  |
Warrants expired (in shares) |  | (1,239,769) |  |  |  |  |
Subsequent Event [Member] | Expiration Date, July 2019 [Member] | Minimum [Member] |  |  |  |  |  |  |
Warrants and Rights [Abstract] |  |  |  |  |  |  |
Exercise price (in dollars per share) |  | $ 3.75 |  |  |  |  |
Subsequent Event [Member] | Expiration Date, July 2019 [Member] | Maximum [Member] |  |  |  |  |  |  |
Warrants and Rights [Abstract] |  |  |  |  |  |  |
Exercise price (in dollars per share) |  | $ 12.25 |  |  |  |  |
Subsequent Event [Member] | Series C Convertible Preferred Stock [Member] |  |  |  |  |  |  |
Subsequent Events [Abstract] |  |  |  |  |  |  |
Number of common shares issued on conversion of preferred stock (in shares) |  |  | 1,775,093 |  |  |  |
[1] | These warrants are classified as liabilities.

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