Stockholders' Equity - Employee Stock Purchase Plan (Details)		6 Months Ended
	Dec. 18, 2018 USD ($) hours shares	Jun. 30, 2020 USD ($) shares	Jun. 30, 2019 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Issued During Period, Shares, Employee Stock Purchase Plans		9,665	7,099
Proceeds Employee Stock Purchase Plans | $		$ 1,944	$ 3,096
2014 Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, capital shares reserved for future issuance (shares)	500,000	401,152
Share-based compensation arrangement by share-based payment award, award vesting period (in days)	90 days
Minimum hour requirement for employees participation in the ESSP (hours) | hours	20
Employee stock ownership plan (ESOP), successive offering period	6 months
Annual compensation limit percentage, employee stock purchase plan (percentage)	10.00%
Annual compensation limit, employee stock purchase plan (dollars) | $	$ 21,250
Shares issuance limit per offering period, employee stock purchase plan	2,000
Fair market value of shares available for issuance (percentage)	85.00%