Table:
March 31,

(in thousands)	2019	2018

Land	$672	$672

Machinery and equipment	1,372	1,296

Office, computer and research equipment	5,267	5,175

Leasehold improvements	798	1,238

Land, property and equipment, gross	$8,109	$8,381

Less accumulated depreciation and amortization	(6,811)	(6,780)

Land, property and equipment, net	$1,298	$1,601

Examine the given table and identify the contents of cells located at specified locations, denoted by row and column indices. The value of every target cell should be presented in the JSON format of {"row_id":"m", "column_id":"n", "cell_value":"<Corresponding Cell Value>"}, e.g., {"row_id":"10", "column_id":"3", "cell_value":"District"}.
Specified positions:
the 9th row and the 3rd column
the 6th row and the 3rd column
the 8th row and the 1st column
the 7th row and the 1st column

The target cell values are as follows:
{"row_id":"9", "column_id":"3", "cell_value":"$1,601"}
{"row_id":"6", "column_id":"3", "cell_value":"1,238"}
{"row_id":"8", "column_id":"1", "cell_value":"Less accumulated depreciation and amortization"}
{"row_id":"7", "column_id":"1", "cell_value":"Land, property and equipment, gross"}