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Retirement savings plan	12 Months Ended
Retirement savings plan	Dec. 31, 2019
Retirement savings plan [Abstract]
Retirement savings plan	8. Retirement savings plan We maintain a 401(k) plan under which all full-time employees are eligible to participate at the beginning of each month immediately following their date of hire. We match employees’ contributions at a rate of 50% of employees’ contributions up to the first 6% of the employees’ compensation contributed to the 401(k) plan. Our matching contributions were $305 thousand, $237 thousand and $264 thousand in 2019, 2018, and 2017, respectively.