Borrowings (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Short-term debt:
Current portion of long-term debt	$ 202	$ 219
Total short-term debt	202	219
Long-term debt:
Capital lease obligations	212	232
Other promissory notes	217	248
Total	429	480
Less: current portion of long-term debt	(202)	(219)
Total long-term debt	$ 227	$ 261

Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal, through the balance sheet date and due to be paid more than one year (or one operating cycle, if longer) after the balance sheet date.

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