Income Taxes Deferred tax assets and liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Operating Loss Carryforwards, Limitations on Use, Value	$ 500
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	21.00%	34.00%
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Unearned Premiums Reserve	$ 2,219	$ 1,371
Deferred tax assets:
Accruals and reserves	885	475
Noncurrent:
Net operating loss carryforwards	30,569	26,566
Depreciation and amortization	240	346
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost	2,102	1,690
Deferred Tax Assets, Tax Credit Carryforwards	547	397
Deferred tax asset, noncurrent, other	243	430
Total deferred tax assets	36,805	31,275
Deferred Tax Liabilities, Gross [Abstract]
Deferred costs	(398)	(279)
Intangible assets	(1,117)	(1,002)
Deferred Tax Liabilities, Other	(775)	(250)
Total deferred tax liabilities	(2,290)	(1,531)
Deferred Tax Assets, Net	34,515	29,744
Less deferred tax asset valuation allowance	(35,609)	(30,701)
Net deferred tax liability	$ (1,094)	$ (957)
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent	(7.80%)	4.60%	(9.50%)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Compensation Cost, Percent	177.20%	828.50%	189.10%
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent	(184.20%)	(857.40%)	(229.60%)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Meals and Entertainment, Percent	(4.90%)	(5.40%)	(3.00%)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Fines and Settlements, Percent	(9.20%)	(2.10%)	0.00%
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent	(11.60%)	(8.60%)	2.00%
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent	0.00%	0.00%	32.10%
Effective Income Tax Rate Reconciliation, Tax Credit, Percent	9.20%	20.20%	7.10%
Effective income tax rate	(10.30%)	0.80%	22.20%
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	$ 4,900