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Stock-based Compensation (Tables)
 12 Months Ended
Dec. 31, 2020
Share-based Payment Arrangement [Abstract]  
Summary of Shares Available for Future Grant The 2014 Plan has since been amended and restated with approval by the stockholders to increase the maximum number of shares issuable, as shown in the table below:
Original share pool137 
2015 increase111 
June 2017 increase67 
December 2017 increase (ratified in June 2018)293 
2019 increase233 
March 2020 increase333 
December 2020 increase800 
Total share authorized for grant as of December 31, 20201,974 
Shares available for future grant under the 2014 Plan was as follows:
Shares Available For Grant
Available as of December 31, 2019119 
Granted(225)
Forfeited57 
Expired29 
Share pool increase1,133 
Available as of December 31, 20201,113 
Summary of Stock Option Activity
A summary of the stock option activity during the year ended December 31, 2020 is presented below:
Options
Outstanding		Weighted
Average
Exercise
Price		Weighted
Average
Remaining
Contractual
Life (Years)		Aggregate
Intrinsic
Value
Outstanding at beginning of year494 $36.64 
Granted90 $5.65 
Exercised— $— 
Forfeited(26)$26.59 
Expired(29)$41.25 
Outstanding at end of year529 $31.62 7.35$42 
Vested and expected to vest529 $31.62 7.35$42 
Exercisable at year end342 $40.63 6.71$24 
The following table summarizes information about stock options outstanding as of December 31, 2020:
Options OutstandingOptions Exercisable
Range of
Exercise
Prices		Number of
Shares		Weighted-Average
Remaining
Contractual Life
(Years)		Weighted
Average
Price		Number of
Shares		Weighted
Average
Price
$5.55 - $9.15
205 8.9$7.63 87 $6.94 
$16.95 - $26.85
101 7.7$22.33 66 $22.48 
$27.30 - $56.70
163 6.6$34.89 128 $35.64 
$60.00 - $229.95
60 4.2$119.04 60 $119.04 
529 7.4$31.62 342 $40.63 
Summary of Share Fair Value of Each Stock Option on Date of Grant using Black-Scholes Model Assumptions The share fair value of each stock option was determined on the date of grant using the Black-Scholes Model under the following assumptions:
Years Ended December 31,
20202019
Dividend yield——
Risk-free interest rate
1.44% - 1.65%
1.67% - 2.5%
Expected term (in years)
5.27 - 6.08
6.08
Volatility
100%-102%
100%-103%
Schedule of Unvested Restricted Stock Units Activity
RSU activity for the year ended December 31, 2020 is summarized below:
Number of
Shares
 Weighted
Average Grant-
Date Fair Value
Unvested as of January 1, 202089 $10.77 
Granted135 $4.45 
Vested(50)$6.24 
Forfeited(31)$10.96 
Unvested as of December 31, 2020143 $6.31 
Schedule of Stock-based Compensation Expense Related to Stock Options and RSUs Granted to Employees and Non-employees Stock-based compensation expense related to stock options and RSUs granted to employees and non-employees was as follows:
Years Ended December 31,
20202019
Sales and marketing$476 $653 
Research and development293 241 
General and administrative1,641 1,361 
$2,410 $2,255