Summary of Business and Significant Accounting Policies - Additional Information (Details) shares in Thousands, $ in Thousands		3 Months Ended		6 Months Ended		12 Months Ended
	Jul. 15, 2020 Employee	Jun. 30, 2020 USD ($) shares	Jun. 30, 2019 USD ($) shares	Jun. 30, 2020 USD ($) Reportingunit shares	Jun. 30, 2019 USD ($) shares	Dec. 31, 2019 USD ($)		May 07, 2020 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Net loss		$ (3,481)	$ (4,003)	$ (7,452)	$ (8,609)	$ (12,408)
Accumulated deficit		(284,564)		(284,564)		(277,112)	[1]
Cash, cash equivalents and restricted cash		$ 11,770		$ 11,770
Common stock sold under agreement | shares		0	570	0	570
Net proceeds from common stock sold			$ 1,504		$ 1,504
Allowance for doubtful accounts		$ 1,276		$ 1,276		1,559
Allowance for potential customer revenue credits		441		$ 441		319
Number of reporting unit | Reportingunit				1
Impairment of goodwill						$ 1,910
Goodwill		0		$ 0
Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Aggregate offering price		50,000		50,000
JMP Securities [Member] | Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Aggregate offering price		$ 13,000		$ 13,000
Paycheck Protection Program [Member] | Harvest Small Business Finance, LLC [Member]
Summary Of Significant Accounting Policies [Line Items]
Aggregate principal amount of the loan								$ 3,320
Debt instrument expected loan forgiveness								$ 2,800
Restructuring and Reduction in Force Plan [Member] | Subsequent Event [Member] | 2020 Restructuring Plan [Member]
Summary Of Significant Accounting Policies [Line Items]
Expected reduction of workforce | Employee	60

[1] Derived from the Company’s audited consolidated financial statements as of December 31, 2019.