Term Loan (Details)		12 Months Ended
	Dec. 18, 2017 USD ($) Tranche $ / shares shares	Dec. 31, 2017 USD ($)
Debt Instrument [Line Items]
Initial tranche amount of debt instrument		$ 7,000,000
Amortization of the debt discount		11,000
Loan Agreement [Member] | Bank [Member]
Debt Instrument [Line Items]
Aggregate principal amount of debt instrument	$ 15,000,000
Loan Agreement [Member] | Bank [Member] | Term Loans [Member]
Debt Instrument [Line Items]
Debt instrument, agreement date	Dec. 18, 2017
Number of tranches | Tranche	3
Debt instrument, payment commencing period	2018-01
Debt instrument, final payment fee percentage	6.50%
Debt instrument default interest payment above normal interest rate	5.00%
Warrant exercisable term	10 years
Fair value of warrant	$ 100,000
Amortization of the debt discount		11,000
Interest expense		24,000
Final payment fee		455,000
Loan Agreement [Member] | Bank [Member] | Term Loans [Member] | Common Stock [Member]
Debt Instrument [Line Items]
Issued a warrant to purchase common stock | shares	50,411
Warrant exercise price per share | $ / shares	$ 2.43
Maximum issuable exercise of warrants to purchase common stock | shares	108,023
Loan Agreement [Member] | Bank [Member] | Term Loans [Member] | Prior to First Anniversary [Member]
Debt Instrument [Line Items]
Debt instrument, prepayment fee payable on outstanding principal, in percentage	3.00%
Loan Agreement [Member] | Bank [Member] | Term Loans [Member] | After First Anniversary, but Prior to Second Anniversary [Member]
Debt Instrument [Line Items]
Debt instrument, prepayment fee payable on outstanding principal, in percentage	2.00%
Loan Agreement [Member] | Bank [Member] | Term Loans [Member] | After Second Anniversary [Member]
Debt Instrument [Line Items]
Debt instrument, prepayment fee payable on outstanding principal, in percentage	1.00%
Loan Agreement [Member] | Bank [Member] | Term Loans [Member] | Prime Rate [Member]
Debt Instrument [Line Items]
Debt instrument, floating interest rate	0.50%
Loan Agreement [Member] | Bank [Member] | Term Loans [Member] | Initial Tranche [Member]
Debt Instrument [Line Items]
Initial tranche amount of debt instrument	$ 7,000,000	$ 7,000,000
Debt instrument, interest only payment end date	Sep. 30, 2018
Debt instrument principal repayment period	30 months
Debt instrument, maturity date	Mar. 31, 2021
Effective interest rate on initial tranche of debt instrument		9.25%
Loan Agreement [Member] | Bank [Member] | Term Loans [Member] | Tranche Two and Tranche Three [Member]
Debt Instrument [Line Items]
Debt instrument, remaining borrowing capacity	$ 8,000,000
Loan Agreement [Member] | Bank [Member] | Term Loans [Member] | Second Tranche [Member]
Debt Instrument [Line Items]
Debt instrument, interest only payment end date	Mar. 31, 2019
Debt instrument principal repayment period	24 months
Debt instrument, maturity date	Mar. 31, 2021
Loan Agreement [Member] | Bank [Member] | Term Loans [Member] | Third Tranche [Member]
Debt Instrument [Line Items]
Debt instrument, interest only payment end date	Sep. 30, 2019
Debt instrument principal repayment period	24 months
Debt instrument, maturity date	Sep. 30, 2021