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Stockholders' Equity
 12 Months Ended
Dec. 31, 2019
Stockholders' Equity Note [Abstract]  
Stockholders’ Equity Stockholders’ Equity
Common stock 
As of December 31, 2019, the Company had reserved 7,720,441 shares of common stock for issuance under its stock plans and 1,717,211 shares of common stock for issuance under its employee stock purchase plan. 
In August 2019, the Company filed a prospectus supplement with SEC to issue 103,734 shares of common stock and additional shares of common stock with an aggregate offering price of up to $4.5 million to one of the Company’s vendors as a consideration for research and development services. In 2019 the Company issued common shares totaling 441,410 for a total consideration of $2.5 million.

Accumulated Other Comprehensive Income (Loss) 
The following table shows the components of accumulated other comprehensive income (loss), net of taxes, as of December 31, 2019 and 2018 (in thousands): 
 
December 31, 
2019
 
December 31, 
2018
Foreign currency translation adjustments
$
(7,641
)
 
$
(6,897
)
Unrealized loss on available-for-sale securities
—

 
—

Defined benefit pension plan adjustment, net of taxes
(230
)
 
(229
)
 
$
(7,871
)
 
$
(7,126
)
 
No material amounts related to available-for-sale securities or the defined benefit pension plan were reclassified out of accumulated other comprehensive income (loss) during the years ended December 31, 2019, 2018 or 2017. 
Accumulated Deficit
Approximately $9.2 million and $9.0 million of the Company’s retained earnings within its accumulated deficit at December 31, 2019 and 2018, respectively, was subject to restriction due to a requirement that its subsidiaries in China set aside at least 10% of their respective accumulated profits each year to fund statutory common reserves as well as allocate a discretional portion of their after-tax profits to their staff welfare and bonus fund.