Represents element information pertaining to percentage of shares on grant date.

No definition available.

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- Definition

Period for tranche 2 which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format.

+ References

No definition available.

+ Details

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- Definition

Period for tranche 3 which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format.

+ References

No definition available.

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- Definition

Percentage of vesting of share-based compensation awards, tranche 2.

+ References

No definition available.

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- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

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- Definition

Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition

Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

+ References

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- Definition

Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition

Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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- Definition

Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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-Publisher FASB
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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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- Definition

Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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- Definition

The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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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.

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- Definition

Percentage of vesting of award under share-based payment arrangement.

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Common Stock, warrants, stock-based compensation, stock options, restricted stock and restricted stock units - Restricted stock units (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Weighted-average grant date fair value per share
Share-based compensation expense	$ 6,388	$ 4,884	$ 2,168
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted common stock issued (in shares)	246,588
Number of restricted stock units
Unvested restricted common stock at the beginning of the period (in shares)	321,662
Granted (in shares)	246,588
Vested (in shares)	(136,062)
Cancelled (in shares)	(62,065)
Unvested restricted common stock at the end of the period (in shares)	370,123	321,662
Weighted-average grant date fair value per share
Unvested restricted common stock at the beginning of the period (in dollars per share)	$ 15.84
Granted (in dollars per share)	24.22
Vested (in dollars per share)	17.11
Cancelled (in dollars per share)	18.82
Unvested restricted common stock at the end of the period (in dollars per share)	$ 20.48	$ 15.84
Share-based compensation expense	$ 2,700
Total unrecognized compensation cost related to unvested stock awards	$ 6,900
Period of recognition of unrecognized compensation cost	2 years 9 months 11 days
Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted common stock issued (in shares)	0	0	0
Number of restricted stock units
Granted (in shares)	0	0	0
Unvested restricted common stock at the end of the period (in shares)	39,806
Weighted-average grant date fair value per share
Unvested restricted common stock at the end of the period (in dollars per share)	$ 3.12
Share-based compensation expense	$ 0	$ 400	$ 600
Aggregate fair value of restricted stock awards	$ 0	$ 2,400	$ 1,900
2017 Plan \| Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted common stock issued (in shares)	246,588
Number of restricted stock units
Granted (in shares)	246,588
2017 Plan \| Restricted stock units \| Subject to a four year vesting schedule with 25% vesting on the first anniversary and the remaining vesting ratably on a monthly basis over the remaining three years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted common stock issued (in shares)	135,058
Vesting period 1	4 years
Vesting period 2	3 years
Vesting percentage 1 (as a percent)	25.00%
Vesting percentage 2 (as a percent)	75.00%
Number of restricted stock units
Granted (in shares)	135,058
2017 Plan \| Restricted stock units \| Subject to a four year vesting schedule with 25% vesting on each anniversary
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted common stock issued (in shares)	40,846
Vesting period 1	4 years
Vesting percentage 1 (as a percent)	25.00%
Number of restricted stock units
Granted (in shares)	40,846
2017 Plan \| Restricted stock units \| Vesting on December 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted common stock issued (in shares)	15,890
Number of restricted stock units
Granted (in shares)	15,890
2017 Plan \| Restricted stock units \| Vested in equal amounts annually over four years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period 2	43 months
2017 Plan \| Restricted stock units \| Vested in equal amounts annually over three years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted common stock issued (in shares)	4,540
Vesting period 1	3 years
Number of restricted stock units
Granted (in shares)	4,540
2017 Plan \| Restricted stock units \| Vesting equally over four years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted common stock issued (in shares)	10,194
Percentage of shares (as a percent)	10.42%
Number of restricted stock units
Granted (in shares)	10,194
2017 Plan \| Restricted stock units \| Vested immediately upon grant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted common stock issued (in shares)	5,328
Number of restricted stock units
Granted (in shares)	5,328
2017 Plan \| Restricted stock units \| Vesting ratably over the remaining 45 months
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted common stock issued (in shares)	1,983
Vesting period 3	45 months
Number of restricted stock units
Granted (in shares)	1,983
2017 Plan \| Restricted stock units \| Vesting ratably over the remaining 43 months
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted common stock issued (in shares)	31,732
Number of restricted stock units
Granted (in shares)	31,732
2017 Plan \| Restricted stock units \| Vest upon the one year
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted common stock issued (in shares)	3,000
Vesting period 1	1 year
Number of restricted stock units
Granted (in shares)	3,000