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Stock options - Activity under stock option plan (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Number of Shares
Outstanding at beginning of period (in shares)	4,720,772
Granted (in shares)	1,412,653
Exercised (in shares)	(43,055)
Cancelled (in shares)	(41,082)
Outstanding at end of period (in shares)	6,049,288
Options exercisable, at end of period (in shares)	2,846,100
Weighted- Average Exercise Price
Outstanding at beginning of period (in dollars per share)	$ 5.24
Granted (in dollars per share)	6.10
Exercised (in dollars per share)	2.77
Cancelled (in dollars per share)	8.50
Outstanding at end of period (in dollars per share)	5.44
Options exercisable, at end of period (in dollars per share)	4.68
Additional Disclosures
Weighted-average grant date fair value of options granted (in dollars per share)	$ 3.79	$ 2.39
Cash received from the exercise of stock options (in dollars)	$ 119	$ 42

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Amount of cash inflow from exercise of option under share-based payment arrangement.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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